Got my Slash PE 4x4 this weekend and got it out on the track. This thing is a blast, and a very capable racer. One thing if you plan on racing you will definetly need the center diff, the handling is borderline uncontrolable without the diff (on the track). The slipper works fine for bashing and it is so easy to swap out the slipper/center diff you can easily switch between the two depending on where your running. I love this thing.