Already using that, I’ve got 119 playlists setup :)
The only downside is that some of the big acts that I like can’t be found there (like the Beatles, Led Zeppelin, Van Morrison), but about 95% of what you look for, you will find, and the rest you can just go to youtube for.
I can see *some* Zep in my search results. No, not all their music, but more than a taste. But you’re right, you can’t find ALL the music there. And their mobile site availability differs from the full site as well.