I've been riding cruisers for 3 years and in all that time I never had as much fun as my first 5 days on a sportbike. This past Monday I traded my 2003 Vulcan 750 for a 2003 ZX7R having never riden a sportbike before. I'm glad I rode the cruiser to get comfortable riding in traffic, basic techniques, etc., but the sportbike just seems to fit the way I want to ride.
Of course my cruising buddies downstate told me I would be dissapointed with my decision and that I'm too old to ride a sportbike at the ripe old age of 29. I still like cruisers, but this bike just feels like a better fit. Thanks for all the good info on this site!