Pro is better for seeking rarer files. If you are only seeking very popular files, then the speeds will not be that much better if at all, depending whether you are already maximizing your download speeds at present.
Connecting to 5 Ultrapeers instead of 3 helps in a small way in seeking further for those rarer files. One advantage Pro has is the ability to download from 10 instead a maximum of 8 hosts per download. The improvements in Pro are generally only subtle & the program itself looks identical.
http://www.gnutellaforums.com/limewi...tml#post330034 is an example of downloading from 10 hosts per file. Of course my bandwidth is reasonably high.
I'd suggest using LW Basic for some time before even considering upgrading to Pro. Knowing how to get the best out of LW should be known otherwise you may find yourself disappointed.