Attaching the seat to the back was a pain as I had no way of easily aligning the two pieces to get the first bolt started. Even more of a pain was the headrest. The headrest should have alignment pins so that getting the bolts in and started would be easy. But alas no pins lots of trial and error. The black knob under the seat that adjusts the tilt resistance needed a wrench in order to turn it. Once assembled and adjusted it is very comfortable. The headrest arrived broken the Union&Scale customer service is excellent and a new headrest arrived within days of calling them.
This chair compares to many $500 plus chairs. If you are looking to invest in your back health without breaking the bank look no further. This chair is perfect for individuals taller than 5' 10" where the Hyken is typically for those shorter. Great purchase.
It is what it is. Fine chair if I get 5 years I'll be happy. It'd be nice if it had a manual in case I need to make adjustments. A couple more inches of height would be good.