I just checked this out and actually its not bad. Though I doubt that it has as many songs as they say. A couple bands I checked out (and granted they are no where mainstream ie: Nevermore, Sentenced, Darkseed to name a few) have a couple songs from each album it seems and then a bunch of clips form the rest. Unsure if this will change but not bad so far, also the sound quality is rather good.
Now on a side note with a X-Fi and any number of good freeware sound recording programs out there 3 plays would be more then enough to build up a music collection :) "What you Hear" FTW.
Course maybe thats why M$ took that feature out of Vista, not saying its not too hard to get back though.