Like Daryl, JamesG, and a few others here, I pay extra for the premium version of SoundClick, so I can upload higher resolution MP3s(320kbps), no adds, and more capacity... It's sometimes buggy, but then, they all are...
I also use SoundCloud, but some tracks just don't sound right to me...
Even when I upload the original wave, I sometimes (not always)hear wow/flutter/warble and other artifacts after soundcloud does its thing...
I have stuff on ReverbNation, YouTube, and a few others that I never go to anymore... I'm starting to lose interest in all of 'em...