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I've been using this one for two years, pretty comfy but attracts dust a lot: https://www.amazon.co.uk/mfavour-Ergonomic-Adjustable-Headrest-Function/dp/B07P6HYSZR
Recently one wheel popped off and wouldn't stay back in, I managed to fix it with a patch of duct tape (cut a hole in the middle of the tape and used that to hold the wheel in) but at this price point I wouldn't expect it to be robust or anything.
I'm sure this has been done to death in here. I'm about to buy an office chair, and am probably going to get this one:
https://www.amazon.co.uk/Ergonomic-Executive-Adjustable-Headrest-Breathable/dp/B081HWKWN6/ref=sr_1_6?crid=23XXB5M2P5CG8&dchild=1&keywords=umi+chair&qid=1625134523&sprefix=umi+%2Caps%2C368&sr=8-6
Anyone got any recommendations of others to be looking at? I had back surgery a couple of years ago, so want to bear that in mind.