Prime video is quite unique, but I'm very much past them putting pre-roll ads on the content I want to watch. It's universally an advert for their own craptastic, homegrown version of an existing well-defined format. If I was interested in watching Law & Order I can start from Season 1, not from their knockoff version of it.
Amazon Music would be another great service I'd be willing to pay for, but all the available clients are so buggy it's an impediment to me using it.