I bought this Matrix about two months ago with 175,000 miles on it for my daily 400 mile courier route and it's been great - so far. Since a 200 mile leg allows me to drive at only 55 mph, I net almost 33 mpg across the entire route - which is better than I expected. The car rides great, runs smooth, and shifts easily so it's been a pleasure to drive.
I like all the little storage compartments, the great gas mileage, and the smooth ride.
I hear an occasional vibration noise or whistling wind. I was surprised that there was no cruise control or electric side mirrors (both standard equipment on my '98 Mazda Protege).