Interesting experience.
I've ordered two of the identical chairs & they ended up sending me two different versions. Ergohuman couldn't send extra parts, so I had little choice but to use what had been sent, as I was not keen to dismantle the chair, repack it & bring it downstairs. One very annoying experience & they could have done better on simple logistics.
The boxes came with loads of fleas (yes, loads of them), and getting them exterminated is impossible. This is an incredibly annoying and painful experience as it's impossible to get anyone out around the Christmas period. We've spent close to $100 on flea bombs thus far.
Considering the above, it doesn't matter if the chairs are good/bad, as we are still dealing with the issues. I hope they will last as long as the flea bites/scars we accumulate daily.