I think they look tall and skinny in pictures. Go see one in person, before you make up your mind, like mickd did. Also, the wheels and body kit on the 135i make a huge difference in looks, in my opinion. (but I'm a bit prejudiced)
I put a tune in mine yesterday, and I should be around 380hp/400ftlbs to the crank now. It is insanely quick, and would do hurt to the 332ti that I have. I'd like to get my hands on a friend's G-Tech Pro, but I assume I'm darned close to 4 seconds to 60 now.
After I did the tune yesterday, I went out and actually gave myself a speed induced headache from a dozen WOT pulls on a country road.