I have one...it sux.
The seats are hard, and don't hold you in place well. The weird honeycomb fabric on the doors will chew holes into your elbows (or clothes).
The car has a fairly high center of gravity, with high spring rates. That translates into a hard ride, with lotsa body roll.
I must say the gas mileage is better than my ZX3 (30-32 MPG avg), and the brakes are excellent too.
I also get free tires for life!!! So, this is my "road trip" car.
I haven't looked for any Matrix sites either, so I'm not gonna be much help there...