Its free, and its great if you have something to share in order to get into the good rooms. I hate sites like soulseek where its nothing but a bunch of leeches and long waits in que. With DC I've never not been able to find even the rarest of things, and rarely do I even have to wait for an open slot. Downside is it can be difficult for n00bs to configure, and the best rooms require a good 10-20 gigs to get in.