I have a 1200 renegade and I put 13,000 km on my first set of aggressive snow trackers. On hard packed snow they go where you point them, with zero darting and with a light feel, almost like power steering. In loose snow they push, same as stock carbides. On asphalt they are the same as stock. On ice they go where you point them. On bridge decks they are the same as stock. They are a little harder on your trailer deck.
The worst thing I find with snow trackers is that a stone will lodge its self in between the runners and you will have to eventually stop and pry it out. This has happened less than a dozen times in 13,000 km.
I am now on my second set of aggressive snow trackers and I just installed a set of semi aggressive ST on my wife's 900 Renegade. My wife noticed the difference right away. She told me that she now has the confidence to take her left hand off the Handel bars to signal oncoming sleds with out worrying about darting.