I only found out about
Emusic because I saw it mentioned in this forum as a place to find music that is not readily available at other online stores. I tried it with the 25 free dowload intro offer and signed up to a basic monthly package. I am not a fan of the 'Use it or Lose it' policy but have no trouble using my quota well before the cut-off date. More importantly, I mainly search out classical music as this can be great value for money. The cost per download is the same without regard to the file size so a concerto 40-50 minutes long might be just 3 long tracks. I believe this applies for some other genres as well.
I had two downloads left last month and DL'd a gem of a piano concerto by Taneyev (Banowetz on piano and highly recommended) which was 35 minutes long in 2 files.

I also like the download manager which is fast, imports album artwork and loads the music straight into my iTunes library.
One thing I don't like, and this applies to most of the other online stores (except Sparks) as well, is the 30 second sample limit. With classical music you rarely get much of a taste in such a short time. Why don't they cut off the last 30 seconds - if they have to impose such a restriction at all
