Exellent refurbishment, totally worth getting one!
I bought one of HM Chairs a few months ago, an Areon Size C fully loaded specially. I wanted to wait a few months before reviewing because I cannot review a chair like this in only a few weeks of use.
I used to have an old gaming chair that would cause me physical pain to sit on after a few hours, and since I started working at home, I could not be expected to sit in agony for hours on end on this old gaming chair. Finding a Size C fully loaded Aeron is very hard, Size A and Size B are very available in comparison, and if you are a very tall and big guy like me, the Size C Aeron is absolutely the perfect chair for people who spends more time sitting than standing.
HR Chairs packaged this thing really well, it only comes in 2 pieces out of the box, the base and the back rest. Assembly is super simple, just slot in the back rest and screw in the bolts given to you, and you're done.
Adjusting the chair is very easy, though I really would recommend watching some videos on what to do and not to do with these chairs when it comes to their functions, just so the experience is smoother and nothing gets damaged internally.
I can tell that these chairs are defiantly refurbished to a high standard, the chair I received had no marks on any of the body or arm rests. It looked practically new!
Though I would say the seat on my chair is a little saggy more than they usually are, and the hydraulic was possibly replaced as part of the refurbishment process and sometimes is a bit sticky when getting off of the chair so it makes as small thud as the chair rises back up into the normal position, but those are perfectly fine with me and doesn't take away from the quality of the chair.
One thing to note is that because these chairs are mesh, they can get dusty really fast, so make sure to have a brush or blower handy every now and then.
Herman Millar chairs are expensive, even at second hand prices, but when people say the change in posture and feeling when sitting on one is totally different, it's true, I never believed it myself until I started using this one, and I've had 0 pain sitting on this chair since I started using it, so it was totally worth it!