I have a 2004 Honda Civic hybrid and recently, after the warranty expired, experienced problems: the IMA (Integrated Motor Assist)and check engine light came on. You'll need to go to a Honda dealer for assistance, parts and repairs. The two reputable auto shops, I used, could not find the faults using their diagnostic systems. This vehicle was well maintained and not abused or run hard and miles were driven on highways. Note: transmission fluid was approx. $16.00 per quart. The NiMH battery started showing signs of not holding a charge shortly before the warranty expiration (80,000) and stopped functioning properly at about 84,000 miles. This reduced the fuel economy from 40 MPG to 34 MPG. Replacement batteries are approximately $4,000. In my opinion, the Honda Hybrid is not worth the extra cost. Buy a CIVIC (standard) instead. Any savings in fuel is quickly lost when the battery goes bad.
I have had my car for about a month. Besides one really annoying rattle in the passenger door, which I am hoping Honda will fix under warranty, the car has been good overall. The ride is fairly smooth for an economy car, and the road noise is limited. Consumer Reports commented on road noise, but I am not sure I see it as a problem -- at least it isn't for me. Braking is very good. What took some time to get used to is the brake-controlled auto-shut-off, which is a primary method for fuel economy. Simply stated, the car shuts off when you stop, assuming the air temp is a certain level and you don't have the heater on full blast. I am very used to it now, and I like the fact that I am not idling wasting gas at stop lights, stop signs, and in stop-n-go-traffice. I love the radio and cruise controls on the steering wheel. They are very convenient. I have also really come to appreciate the two-part display for engine performance and speed. The fact is that I tend to pay very little attention to the engine performance information and much more attention to the speed limit. Also, I think the tilt wheel, automatic climate control, and power windows/doors are really nice features for an economy car. If I had to do it all over again, I would definitely buy the Civic Hybrid.
I'd said I'd never buy another car unless I could get one that gets 40 mpg or more. The display shows the ave mpg for the current trip, and I love seeing that! Other than that, the car's a Honda - I've had Hondas all my life and love the reliability of them.