First off, I was disappointed to find a broken rubber ring (part of the foot rest slider). I was expecting to contact the seller after finishing assembling to request a spare. Then lo and behold I realised there's a separate compartment in the fixings pack with a spare of each type of bolt, cap, and even one of these rubber rings. Yes, the chair even came with a spare rubber ring. I was impressed by this.Assembling the chair was a little fiddly, with the instructions often glossing over key details. But this is common with any such product and anyone who's put stuff together before and takes a bit of time and patience will be fine. An example is the plastic covers over the back rest hinges. It takes a bit of "this doesn't feel quite right" to realise that you need to locate a spindle on the hinge with a hole in the cover. If you miss this detail, you can still bolt the two parts together, but they won't be properly aligned. This wasn't highlighted in the instructions.Having put it all together, I was a little surprised by just how firm the padding was. My old chair was a bit of an executive armchair, which was much more giving to sit in. Having said that, it all feels comfortable. I wasn't sure what I'd make of the neck and lumbar pillows. I've tried retrofitted lumbar pillows before and rejected them. The pillows with this chair both feel like they belong there. It's easy to adjust the height of the lumbar pillow, which pretty much stays put, held in place by the sides of the back. Even the neck pillow feels comfortable enough. Time will tell, but I have the feeling that in a normal working position, this is a very good combination of firmness, softness, and support. I feel comfortable and supported whilst sitting up without feeling like I'm slouching or sinking into poor posture. When reclining, though, the pillows and foot rest come into their own. In my old chair, reclining would force the small of my back down, which wasn't good for my spine. My legs also had no support. This chair solves all those problems. Unlike the fixed arms on my old chair, the arms on this fit easily under the desk. This was a bit of a bug bear with my old chair.All in all, this is a great chair. It should score highly in both comfort and posture/support. It's easy enough to assemble, and the spare bits were very much appreciated and point to the thought that went into design/production.I had two slight niggles. I'm not used to twisting arm rests, so I have the habit of pushing against them even getting out. Of course this makes them twist and move underneath you, undermining your balance. This is probably just a "get used to the difference" thing. I also found the casters were a little reluctant to change direction. Having pulled yourself up to the desk, it required more effort to persuade them to turn 90 degrees so you could shift position a little left or right. I actually want to perform this action of wiggling left or right quite often, so this quickly felt irksome. They may ease up over time, but I solved this particular niggle by swapping out the supplied casters with the ones from my old chair (ahh, old faithful, some of you lives on).I'll update this if I find any comfort issues after spending full days in the chair. Otherwise, assume I'm getting on great!