I wasn't able to hear a difference on that website, but I tried some songs on my computer and there was audible hissing in some parts (it mostly sounded great to me, though). All that was gone at 48kbps, though. It's kind of crazy to see a full-length album sounding amazing at 20MB. I think if I were to convert everything I'd go a little higher (64?) to be safe, but wow.