Read the guidelines: http://www.insightrental.com/guidelines/
It's like a Prius, but better. Driven carefully, the CT can beat my Honda Insight at hypermiling. And it's more technologically advanced than my Lexus GX. I love the CT for its efficiency, the premium 10-speaker audio system, and overall comfort. The navigation system is actually useful for showing upcoming rest areas and exits on the highway, as a complement to your phone's GPS. If you're a driving purist, rent my Honda Insight with its manual gearbox, light weight, visibility, and tiny size. But if you want to cruise in comfort while still saving gas, the CT is your car.
My driver's review of the car:
I should warn you that this car isn't exactly fun to drive. It handles great, with the wide low-profile tires. But I can't tell how wide it is, making it hard to cut through traffic. The transmission has three modes: Eco, Normal, Sport. In Sport, it's not that slow. When you mash the drive-by-wire throttle, the CVT quickly spools up the engine and the planetary gearbox mixes in electric power to give you good acceleration response. It's an engineering marvel. But the sound is weird. It lacks the feeling of power that comes with shifting an ordinary gearbox or hearing the revs rise with the car's speed. Finally, the hybrid system's information display is horrible. No useful quantitative information, just some silly animations. You have to flip through too many screens to get what you want. Why can't it show engine rpm and regenerative braking simultaneously? The engineers clearly didn't read Edward Tufte.
My renters seem to like the CT, but I think it's a little bland. I use it regularly for its utility, like if I have to make phone calls in a quiet cabin while driving to the beach with a surfboard, but I don't get excited about driving it. I generally hop in the Insight or GX first if they can do the job.