Well, Pro connects you to 5 ultrapeers whereas Basic connects to 3. Plus, as I said you can download from more hosts. So theoretically you get better search results, better speed & a "turbocharged" connection.

What you should do is search (top right, between faq & home) for other threads about this. You'll find heaps of different opinions & it might help you decide whether to go for Pro.

Just remember though, if you've got a slow connection, Pro's not going to be able to magically fix it