We have 2 prius' and love them. In fact, we've owned 3. When I totaled the one we bought a mini-van, and 6 mos later traded it in on a prius. They've been out quite awhile. We bought all 3 of ours used and we love them. They've all had at least 30K on them. The newer ones get better mileage, but even the older ones get 30+ mpg. DH is a newer one, maybe 2 yrs old and it gets 40 mpg. I'm not a 'good' prius driver, so I only get about 30-35 mpg (which is still almost double what the van got, so I'm not complaining!). The funny thing about them is that at a red light, the engine shuts off. It goes to electric, so there is NO noise. Don't be alarmed :D. There is no driving difference. It's the same as any other car. IF you accelerate fast, you use more gas. The one thing that is fun, you can coast through a parking lot on the electric and scare the poo out of people who are walking down the middle of the row when they turn around and see you, not that *I* would ever do that (DH likes to though). Toyota's have been around the longest and rank really well by consumer reports, so I would recommend them.
hth