I noticed slightly faster search results and notably faster downloads with Pro (I have good bandwidth).
Some people report the same results with Frostwire (free).
Phex has also received good reviews.

If your highness is ready to venture beyond the limits of the Gnutella net, pm me and I'll send info re torrent downloading. Though I would follow the suggestions from LotR if you're still rather new to all this.

There are a few ways to improve your downloads without investing more $.