I have had a 2006 for about 1 and half years. I love driving the car and it certainly is fast. The reliability has been horrible though. Blown turbo, motor mounts, PTO seals, wheel bearings and more. I've sunk way too much money into it.
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I'd definitely stay away from purchasing this vehicle.
Like Jason, I too had this car for 3 years. Had the same problems in addition of the transmission going bye bye at 43k. It was my first "new" car at the time. I was 25.
While I had fun with it before it started to cost me a lot, I think Mazda wanted to make a car that looked better than it really was. All the numbers were great on paper but everything was of cheap quality IMO. I liked AWD but I couldn't compare with other cars, engine was ok but not reliable (stuttering), sound system by bose ok for young crowds, cheap HID lens/bulbs just to name a few.
I was by no mean crazy on the road. I needed that car for passing power and snow driving. I was lucky enough to get even when I sold it back to the dealer after 100k.
This car is not cheap to maintain, at all. I would have been better off with a used Lexus IS250 AWD or audi A4 Quattro minus the passing power...