It's only worth it if you plan on doing a lot of downloading. Just make sure you get it from the official site. I myself will never pay for a P2P program. Gnutella is free, open network. I wont pay for an app just to download the same files I can with the free version. Same speed, same files across the network, whether you pay or not. Paying doesn't make any diff. in speed nor connections. You can only download as fast as your ISP allows you too so dont get fooled into thinking it's faster or better than basic because it's not.

(my 2 cents)