I got the Xtreme model for trips to the snowy mountains because the metal knobs grip the tires better in freezing temperatures, especially if I'm going to help someone who does not have off-road tires. Initially I was going back and forth between the MkII and Xtreme, and once I received it I was very happy with my choice. This is widely acknowledged as the best recovery board on the market and I can see why.I also recommend the MaxTrax carry case if you're storing this inside the car. While it's an expensive case, it is 100% worth it, there is a night and day difference between this high quality case and the cases that are provided with cheap boards.