I'm okay with Amazon Prime, but it does not have nearly the selection that I'm looking for.
The services are great if the thing you are looking for is popular or recent, but they are probably not going to fulfill the specific niche that you might be interested in.
Hell, if I tunes had one of those streaming services that don't require an I-Phone, I-Pad or I-pod Touch, I'd jump all over it. I have a better shot a finding the drek that I like in the Itunes store than in the other ones, believe it or else.