I've used slsk for years, 5 at least.

It's a very clean program. It's easy to download albums. You can browse users files and you can add users to your list. It has some nice search syntax. You can chat with users and it has chat rooms. It has a simple interface with no annoying designs and crap like that. You can ban abusers/trolls/jackasses who don't share their music from downloading from you, and you can put users on an ignore list.

It's a great program. The whole idea of it really is awesome. It makes it so nice to download stuff and very easy to chat with users. I've met some interesting people there and have been introduced to some great music that I never would have known about if I didn't use it. 1000! x greater than any other p2p file sharing program out there.

... and that's a 1k factorial