i've never owned an iroc or 3rd gen z-28, but i've owned 3 3rd gen camaros (sport coupes).
1) i hope your back is in good shape because they ride rough. This is not necessarily a bad thing, but i want to point that out to you.
2) No real problems, easy to work on. i didn't have an easy time in the snow, but think this has more to do with tires than other things such as RWD, more weight up front etc. i think it's generally a well built, well designed car.
3) These cars really handle well. So, at least with me, they kind of intrinsically made me want to drive a little more aggressively than what i would normally do. This got me into trouble occasionally. So you have to be careful about that.