I've had mine to 100mph quite a bit on the highway. I have a 5spd manual though and it has plenty of power. I love the functionality of it too!
However, it does NOT handle like it is on rails (laugh) It's like a dry sponge. My Mazdaspeed3 handles like it is on rails but the 5 is absolutely cushy by comparison.
yeah Its all in your reference I spose. your MS3 is a cadillac compared to my shifter kart, and the MZ5 is a sports car compared to my Tundra... lol