Marc Krevitz
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Review

Review of the ProtoArc EC300: A Welcome Addition

July 21, 2026

To be absolutely clear, u/ProtoArc_official has sent me the EC300 for free as part of their testing giveaway (r/ProtoArcHub), and has requested this review. I will not be financially benefitting as I am gifting this chair after my review process has finished.

I am under no obligations to color my reviews as ProtoArc has placed zero constraints or requirements. Beyond that, I have opted to completely avoid using generative AI, for obvious reasons.

Also, this is my first review! Please feel free to provide any pointers regarding structure/content. I’m also online frequently, so for those in the far future, don’t hesitate to reach out via a comment!

Some background

Around four months ago, I went all-in on making an educated purchase decision for my next chair. In doing so, I developed a “chair hobby” like many in this subreddit. I’ve also taken up a side-hustle, picking up damaged/blemished/liquidated chairs to resell! As a result I’ve bought, sold, and fixed a decent number of chairs.

I’m 5’10, 160LBS, like a more aggressive lumbar, sit in multiple positions, and appreciate a bit of plushness in my cushions. I tend to enjoy seats pitched a tad forward (like the Gesture), as my weight distribution tends to centralize around my rear thighs and coccyx. I struggle with lower back pain due to very mild scoliosis, an inactive lifestyle, and back/core muscle imbalances that I’m currently attending physical therapy for.

What I’ve tried

Since I’ve gone through a large portion of chairs, I’m happy to answer comparison-related questions to the EC300. I have spent minimal time with the budget picks, so my ability to properly compare and judge this chair as a budget pick is limited. If I do not feel confident in my comparisons, I’ll simply say that.

  • Budget: Sihoo M18, ProtoArc EC200, Colamy Atlas, Staples Hyken (Regular), Staples Sorina, E-Waste chairs (think generic cheapos)
  • The big 3:
    • Herman Miller: Equa, Mirra 1, Mirra 2, Aeron Classic, Aeron Remaster, Sayl, Embody (Regular), Cosm, Vantum
    • SteelCase: Leap V1/V2, Think V1/V2, Gesture, Amia, Turstone Crew, Karman
    • Haworth: Zody Classic, Very, Fern (Digital Knit w/Atlas Headrest)
  • Other:
    • Libernovo Omni (original), Knoll Generation, Knoll ReGeneration, Knoll Life, AllSteel Acuity, Sitonit Amplify

Review

Shipping and condition upon arrival:

No issues with delivery, but the box was banged up and lacked adequate padding. All parts were individually packaged in scratch-proof bags, with enough wiggle room to knock into each other during shipping. The more fragile pieces are clear candidates for damage in shipping.

In my case, the tools package unsealed in the box, and I had to hunt for all of the loose screws. The plastic stabilizer that goes around the gas cylinder arrived cracked, but a bit of B7000 glue and heat fixed it right up, so I didn’t request a replacement.

Assembly:

Assembly was straightforward! The instruction book and the site were as helpful as they needed to be. All tools were provided, and functioned fine. When attaching the backrest, I did find some issues with alignment (unscrewed and reseated a few times), but other than that, fine!

Features:

  • Recline and Tension: The knob affects the initial recline resistance, but after roughly 45°, it drops to zero resistance (making the transition feel a bit jarring). The actual recline itself is deep, and the lock works fine! Only one position to lock, but that is expected at this price point.
  • Seat and Seat Depth: The seat is attached to the armrests, so any adjustment to seat depth moves the armrests as well. Surprisingly responsive!
    • The seat itself: Fairly firm with enough give. Zero bottoming out, mostly flat, with a rounded and raised contour on the edges. Plenty wide, and you’ll also have no trouble moving the seat forward to account for the aggressive lumbar, so plenty of room for the long-legged folks.
  • Armrests: Smooth adjustment mechanism, zero complaints. The armrest positioning itself is a bit wide, which is a personal preference, but may impede those with smaller frames.
    • The armrest itself: A firm feel, cheap but does the job.
  • Headrest: Surprisingly decent for the price. Because the chair’s backrest is adjustable, you can easily align the headrest to your neck height. The headrest has multiple angles of positioning, and maintains positions well. It’s made of the same firm mesh as the back and lumbar, so it’s far from the comfort of a plush atlas headrest, but it serves its purpose.
  • Adjustable backrest w/ Lumbar: I think they’ve done a swell job in most ways. The range of adjustability is quite large, and I suspect most folks will be content with it. That being said, I do worry about those on the smaller side (<5’6).
    • Backrest adjustment mechanism: A bit of a slight learning curve, but intuitive once you understand how it works. The locking mechanism for the backrest works as intended.
    • Lumbar support: Now here’s where this chair will be polarizing. The lumbar is aggressive. It supports your entire lower curve and a bit more, and is non adjustable (outside of backrest movement). This is clearly ProtoArc’s attempt at a more aggressively supportive model, and they have succeeded. If you want a “less aggro” lumbar from ProtoArc, go with the EC200.

TLDR

Pros:

  • Overall a solid package for the price. A functional headrest, a semi functional tension knob, a decent seat depth adjustment, comfortable enough seat, deep recline, and smooth armrest adjustments.
  • A welcome lumbar-aggressive entry to the budget chair scene. Happy to place this along the Hyken Pro, Colamy Atlas, and EC200 for my budget recommendations.
  • The back height adjustment mechanism is a welcome gimmick, and functions as intended.
  • The headrest is surprisingly functional given the price, partially due to the backrest’s adjustability.
  • The recline is fairly deep, and for me personally, pairs well with the lumbar mechanism (which is often a point of concern with cheaper chairs). Lounging is enjoyable!
  • Great pick for those with some extra height. The wide back and headrest adjustability paired with a large seat and wide armrests is ideal for tall folks.

Cons:

  • This is not a giant killer. Quality refurbished or used high-end chairs will outperform this chair on any metric at the same price. I will always encourage others to buy used or refurbished in this price range.
  • The shipping needs improvement. As it currently stands, I am worried about the damaging of fragile parts.
  • The materials are cheap. A symptom of the price and unavoidable, but something worth taking into account.
  • The lumbar is strong. If you prefer a milder support, you should avoid this model, as the lumbar itself can only be adjusted in terms of height, not intensity.
  • The armrests are FIRM and far apart. They serve their purpose, but they are not the most enjoyable to put weight on. For those with smaller frames, you may find the distance between armrests to feel unnatural.
  • The tension adjustment is poor. Tension adjustments function as normal up to roughly a 30° to 40° recline, and then it defaults to 0% strength tension. This makes the process of reclining feel a bit jerky.
  • This chair may not fit those below 5’6 or 5’5, but it’s possible I’m mistaken about the exact cutoff.

Overall Impression

There are clear shortcomings to the EC300, but for the price, I will say it fills a much-needed niche for a lumbar-aggressive all-rounder budget pick. If someone wants to buy new with warranty (and is on a tight budget), this is a very viable option. Overall, I’m content, but I’d happily pick my more expensive models over this.