The Pro version has not changed in price in a few years at least. Can't think of too many products that haven't changed in price over that time. $18.88 is not a drastic amount ... what equivalent to a few macdonalds or something. lol

Connects to 5 ultrapeers instead of 3. Can download from a max of 10 instead of 8 sources per file. Is higher if have T3 connection. Is better for finding the rarer material. No difference will be seen in search results if only searching for common files.