Let's not talk about the positive and assume anything not mentioned, it's all good. Okay, now the negatives, and after that I'll opine. N1. Comes with standard cheapo made for carpet plastic casters (wheels). Add 30-40 bucks to the cost of the product because no one uses the provided wheels. N2. The head rest. Remove the housing for it and inspect it. The plastic gear thing inside it that allows setting height was marred smooth, but others have stated tightening the side bolts, which are only visible after removing the 6 screws that keep the housing together, need tightening. This piece is fully assembled from the factory and there is no mention in the manual about it possibly needing adjustment. Thoughts and opinions: Great bang for the buck, less expensive than a used HM Aero and slightly larger as most used HMAs are not the XL model. Arm rest adjustments are nice, and not something most think about until they've lived in the chair for a few work weeks or more. Lumbar is solid. Lumbar wings seem gimmicky , but man do they provide some serious sustained support for better posture. It took a few months but once I started using them I can't imagine a chair without them. Comparing to my in office HMA this is the superior lumbar option - and I've occupied 4 different HMAs, none had a lumbar that I didn't need to frequently adjust. The seller/vendor/brand: 10 year warranty, they stand by their product and they provide documentation and schematics for this chair which most sub 1k$ units do not and will not provide. Lastly, this chair more comfy than a steelcase series 1/2 and a herman miller aeron. I've been in IT for a long time and I'm very familiar with enterprise grade cubicle chairs - this product wins. Read more