REVIEW OF THE BLACK-S1 Carbon FiberBought this chair to replace a worn out chair at my office while staying on a budget. Overall, is a good chair for the price.PROS:- Good build quality for the price- Assembly is just as easy as other similar but more expensive chairs- Should be comfortable to sit in for extended periods with a decent neck pillow- Reclines way back (but I don't think it's balanced properly to lay back in completely flat)CONS:- The lumbar pillow is too big in my opinion (and I'm a skinny guy), it pushes you way too far forward in the seat and I would never use it had I kept the chair- The most noteworthy compromise in this chair is in the base of the seat. First off, if you are a wide set person, this chair will likely be far too narrow and it felt narrow even to both me and my wife (both tall and thin people). Finally, the most glaring issue with is was the side pad areas of the base of the seat. The angled side pads that make up the edges of the base of the seat are not really part of the seat at all, but purely cosmetic. They appear to be angled extensions of the seat base but are actually just empty airspace with PU leather wrapped around a foam padded bar on each side. Feels VERY strange on the sides of your thighs when the sides of the chair don't give normal resistance to your legs if you're used to a full and supportive bucket seat style. This is the only reason it's not a 5-star chair for me.It appears that the Black-s5 does not have this seat base issue, and it sells for a reasonably higher price, this is likely the model to be choosing!So if you're like me and are coming from your personal gaming/office chair in the $400+ price range, you will definitely notice immediately how they are able to sell this chair in the $100 range. While it is perfectly functional, it is not up to par with the $400-600 chairs on the market, but I don't think it's trying to be.I think if they improved the seat base and sold this chair for $150-175, it would be an outstanding value product.For the current price, it is a good value and a perfectly functional chair and likely a very major upgrade for someone using an uncomfortable office chair that hurts their back while gaming or whatever.In the end, my colleagues rejected the chair simply because they didn't like the high back design vs the medium back height chairs they were used to.The seller was very accommodating with quick customer service to help solve the unfortunate issue of having an unpacked & assembled, but unwanted chair. Very high regards to the seller!