We purchased our Prius new in 2009 and we love it. We get 50 mpg only have to fill the tank every 2-3 weeks (and not wait in line for the pump as often), and it only takes 8-12 gallons to fill. We save $800-900 per year on gas without changing our driving habits. We like that for a smaller car, it has a ton of storage and hauling space, because it is a hatchback and the full back seat can fold down instead of some stupid little fold down window. Also, there is a ton of storage space up front. With two roomy glove compartments, a big console storage space, and a smaller storage space under the radio, plus two good sized door pockets, there is no lack of storage space for whatever the driver needs. Since I keep a lot of extra junk in the car, that's helpful. One pet peeve is that the A/C recharger powers off when the car is turned off, so if you are charging your phone, when you turn off the car, it stops. Love the bluetooth built into ours so that I can use the phone hands free in the rare instance that I used the phone in the car (about once/week). I love the various controls that I have on the steering wheel. I can control environmental, radio, etc from the steering wheel.
We find the car quite roomy for a small car, but then YMMV depending on what you are comparing it to. This replaced our Nissan Sentra and is far more comfortable and roomy than that car. Also, the storage capacity is much better (the Sentra had the little half-window fold-down which was pretty useless unless you were carrying skis or plain 2x4 lumber). We have two Britax Roundabout 55 car seats for twins in the back of this car in the outboard positions (using LATCH) and I can still push the driver's seat all the way back (I adjusted the angle of the car seats using a pool noodle as per instructions in the car seat manual). Works great as our commuting car and all four of us commute together to work/daycare. I even have a big double stroller in the trunk.