Amazon has the advantage over some company I don't have experience with, of that I know returns are pretty easy and generally not questioned at all (at least for me, long-standing account in the UK, with infrequent returns, it might vary for new accounts, those who return more than they keep, or those in countries with worse consumer rights at the legally enforced level).

My two most recent examples: a couple of rolls of 3D printer filament that looked nothing like as advertised (bad sales images there I think, rather than a comingled-with-a-cheap-scammy-alternative issue) which was taken back unquestioned for same-day full refund despite one of them being opened, and a couple of years ago a replacement drive for my media RAID array that, while the right drive and not, as far as I could tell, counterfeit, certainly wasn't new/unused which is what I ordered, which again was taken back with no quibble or cost (other than my time of course).

There are problems dealing with Amazon sellers, but those can mostly be avoided with care and a healthy dose of cynicism (to avoid ordering crap in the first place). I'd never buy some things from there though: safety equipment, for instance.