Mirrors and seat are easy to change. I LOVED my old Speed Triple but I felt it was almost too much power for such a crisp handling and nimble bike. Had a few 'almost' high-sides from getting on it too soon. From everything I've read and heard, the Street Triple is the way to go. 107 BHP in a 399 lb package with the smoothness and torque of the triple. I just can't see any reason to get rid of either of my bikes for one and I definitely can't get a third bike.