I was leery about SuperSteer before I got it, and all I can say is that I wouldn't buy another tractor without it now. I was afraid of the added complexity, but it seems to be built just as stout as anything else out there. Also, I was leery of the adverse-yaw characteristics it has on the loader, but that is just something to get used to - and use to your advantage when you become proficient. The SuperSteer option allows me to get into and out of places that would be very difficult with regular steering. It makes my TN feel much smaller than it is.
The only negative that I can think of is this: you probably don't want to loan a SuperSteer equipped tractor to someone who has a lot non-SuperSteer tractor seat-time. I say this because it does make the loader sway to the left when you turn to the right, and vice-versa. If you loan your tractor to a friend, and he is doing loader work close to his house or car, that tractor might just make the kind of impression that you (and he) didn't want...