My wife has an 07 tC. It's a 5 speed.
Stock, it was not much fun to drive... I didn't care for it, atleast. The road noise is nearly unbearable, and the seats suck for a drive longer than an hour.
I put TRD Springs/Struts, TRD Exhaust, a TRD Sway bar and nice tires on it and it handles like it's on rails now. It's quite fun to drive. It's not fast, by any means. My 4Runner would eat it alive. (That said, it also has its way with V8 4th Gens =p)
The tC still sucks on long drives. I had to sound deaden the whole car to mellow down the road noise. It made a big difference, but it's still LOUD compared to the 4Runner.
All in all, I would not recommend a 1st gen tC. The gas mileage is not that great, the ride sucks, and it's slow. Handling with a few mods? Quite fun.
The 2nd gen tC is not much better. In my opinion they're ugly as sin. On back roads I have "raced" a friend on some back roads his 2nd vs my wifes 1st. I kill him every time (I am a better driver, and his is stock...) That said, I do enjoy that 6th gear for freeway cruising.
Cliffs-
Wife has a tC. Handles very well, is slow, gets MEH gas mileage, I don't like it.
I want to get her in a Prius, is250, or a ct200h in the next year.