suede shoes piss me off. they can be very nice looking, but you have to count on great weather and an accident-free controlled environment to wear them. as a 20-something in nyc, that happens almost never. i have a beautiful pair of bruni magli brown suede loafers, and i've worn them about 8 times in 5 years.
also, i'd never wear suede with a suit. doesn't look right.
I regularly wear suede shoes with suits. I think it gives a more traditional outfit a more distinctive edge. That and the fact that I love suede shoes regardless of what I'm wearing. I like texture in clothes so suede fits right into that.