I am very dissapointed with my Mazda3! I've had it for 6 months and I've had many problems with it. I live in Ottawa, Canada and winters here are quite cold. The car never started on the first try on a cold day, no hot air (there is a defect in all 2004's that no one knows about), there is noise when one turns (most likely from the axles), interior rattles quite often, and the biggest frustration is the vibrations from under the seat. I've been fighting with my dealership to fix these problems, but so far they do not have any clue what causes such things. The replaced my axles, brake pads, heating system, and nothing has been FIXED! Be warned about this car.
It handles amazingly! That's all.
Stereo system (static noise while listening to all the stations). Poor quality. I would upgrade to Bose if I had the chance again.