i've been a emusic subscriber since 2001 and have never been disappointed, even after they went from unlimited downloads to metered subs.
if you are looking for chart top songs and willing to put up with DRM then eMusic is not for you. however if indie music without DRM boat anchors at a lower cost then eMusic for you. right now is quickly becoming the digital repository for smaller labels with titles going out of print. i.e. SST, Dischord, Twin Tone, etc. it's also bring on board several UK indie labels making available releases only available as import, like Cherry Red
it's also got several big indies like YepRoc, Merge, Matador, Ryko, Sufjan's label, Kill Rock Stars, Vice, Din Mak, and added several V2 UK single b-sides. Sure it's missing SubPop and others but