My wife and I bought a revolution and an Oasis back in 07/08 and used the heck out of them, enjoying every weekend year round (we live in Florida). Most of the time my wife would be in the Revo and me solo in the Oasis. She would often circle around me taunting me to keep up (anyone with a revo knows how nimble they are).
We bought a TI in spring 2010 but never used it in Kayak only mode until this spring where we went up the small Manatee river (near Tampa FL). I just have to say I was extremely impressed how stable and responsive the TI kayak is. Now I am finally faster than my wife on her Revo, and even tried to run circles around her taunting her to keep up (didn't work, river was too narrow, managed to scare a few turtles though). The TI also seems to run shallower than the Oasis.
Who knew... I bought a great sailboat that turns out to be a pretty good Kayak as well (pleasantly suprised)
We have always car topped our boats (we travel alot with a camper) and I am amazed that at least for me it's easier to load and unload the TI on the roof than the Oasis by myself. It's only a little longer and a little heavier (not enough to notice). It's easier because of the carry handles, you have something to grab onto when lifting, at least on our older Oasis there was nothing to grab onto making it very difficult and awkward to load by yourself.
One of our favorite kayak things is running rapids in Colorado, Wisconsin, and Michigan (not huge rapids). I can't wait to try the TI at that (maybe next summer). We are thinking about going up the Santa Fe river kayaking one of these weekends. On the Santa Fe there tons of crystal clear springs to swim in, it's a really fun place to Kayak.