Well lucky you, because I also am in Chicago, and I also have the Rockstars. I got them February of 2013 and they survived the rest of that winter and last winter perfectly fine.
There are 3 things I don't like about them.
1) The plastic center cap being shiny makes people think they're worth something and I've had them stolen before
2) In extremely heavy snow a center cap fell off (no idea when it happened, but one day I looked at the wheel and it wasn't there).
3) Personal preference.. but seems it seems to me that a lot of modified Jeeps in Chicagoland (that I see) have rockstars. Personally I like being unique, not that the Rockstars don't stand out, its just personally I think there's a lot of them.