Duorest Alpha Ergonomic Office Chair - Dual Backrest Design for Lower Back Pain Relief, Adjustable Mesh Executive Chair for Home & Office Workspace (White/Blue) - Perfect for Long Hours Sitting, Gaming & Remote Work

Duorest Alpha vs. D2A:I've been searching for a comfortable chair for years and never have been happy with any of the ones I've tried and have spent a lot of money on. I work in front of a computer for up to 10 hours a day and have chronic neck and back issues.The chairs I have tried thus far have been:- Herman Miller Aeron- Herman Miller Embody- Steelcase Leap v2- Steelcase Gesture- Lifeform- Haworth FernI gambled on the D2A and really liked the back rest and sitting position, but the seat pan is not ideal for someone my size.At 6'2" and 200 lbs. the seat pan is too shallow and the distance it moves out is very limited (at most 1.5"). In addition, the latex foam immediately bottoms out and you end up with very sore sitz bones in less than half an hour. I tried to find a seat cushion to relieve pressure points, but the height of most cushions changes the seating position and ruins the benefit of the back and headrest. And, having to get an additional cushion adds anywhere from $50-$100 to the price of the chair just make it comfortable.Additionally, the overall quality of D2A reminds me of a mid-level task chair you get from Staples. The seat module and levers are made of very lightweight, flimsy plastic and there is zero tension control for tilt. The Donati self-adjusting tilt mechanism is worthless in providing any real resistance or tension.However, since I really liked the back rest, I decided to give the Alpha a try.The Alpha is in a totally different league in terms of the quality of the seat pan module. Ever since my experience with the Herman Miller Aeron, I have been hesitant to use mesh chairs. But, the reviews for the Alpha seemed to rate the comfort highly and I'm glad I decided to try it.The mesh seat relieves the pressure on the sitz bones and the curved shape places your lower back in a better position against the backrest. The seat module is much heavier and more substantial, the levers feel quality, and seat pan sliding mechanism actually moves properly.There is also one other difference that I didn't know about until I put it together. There are two depths you can place the back rest into the seat module. This first position places the back rest well over seat pan and would be good for shorter or smaller folks. The second positions moves the back rest about 1.5" further back from the seat pan (this is in addition to the seat depth adjustment). This difference seems small, but it literally was the key thing that made everything work for me on this chair.The assembly on the Alpha is also much easier and fitment tolerances are much better.The arm rests are slightly different on the Alpha vs. the D2A, but they are both adequate if not a little cheap feeling and are made of very hard plastic. The Alpha arm rests are ever-so-slightly tapered at the back and a tiny bit longer. They rattle a little when moving around, but adjustability is fine and you should be able to find a comfortable position with either.I recommend getting these pads for the arm rests. They fit perfect and are very comfortable:https://www.amazon.com/gp/product/B01M8F9IYC/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1The headrest on both models is a bit cheap. It would be nice if they were slightly more padded, had another couple of inches of height travel, and could be tilted forward to reach the back of your neck while sitting in the locked vertical position. They aren't bad... just not great.I like the color-way of the Alpha I got in White/Blue.tl;dr- If you are looking at this type of chair you can skip the D2A and just get the Alpha.- The Alpha, while still not a $600 chair in terms of quality of materials, seems to be a much better value vs. the D2A (which should be $250 max).- Time will tell if the materials hold up, or not.