4 star, quality product, easy assymbly, but no instructions on how to. Worked from the base up and logically selected which bolts went where and why (I always liked puzzles) so I did get it all together despite the stickers on the arms which indicated L and R but we're only L and R if you were standing in front of the chair and not sitting in the chair which would have made more sense to me. I assymbled it by myself but would have been easier if there had been two as the armrests we're a bit tight in fitting the bolts in upon the plates from underneath. Really love the massages and the variety and length of time in settings. My keyboard fits in my lap but the arm is not really wide enough to use the mouse and even needs a pad draped over it to get a good movement of the curser. Would have loved to have given it a 5 but it's only a 4.