I would like to rate 5 on 5, but can't because 3 points :
1/ a small plastic piece on the left is broken. Doesn't really matter, but no quality control on this product ?
2/ quick installation guide is note for this product. It seems it's a generic installation guide. It refers to a complete guide included - which is not included.
3/ there is additional cushions for the back and the neck, but the attachments systems are for another model, so they are completely useless...
Despite all of the above : it's a very good, bid, solid and confortable chair. … plus