Shaggy,

The Traxster turns great on any kind of carpet, even deep shag carpet.  We never have thrown tracks.

The Lynxmotion tracks are really nice, and they have tons of traction.  We had a customer retrofit a Serializer on his bot using those tracks, and while they didn't jump off the sproket, they did stall the motors enough to reset the Serializer (h-bridges rated at 4 amps each).  My point is that they grip REALLY well.

I looked into using those Lynxmotion treads on the Traxster, but I was trying to hit a certain price-point, and those tracks were just too expensive.

If you need to add more grippyness to our tracks, then you can apply the Plasti-Dip spray I mention in the Robotics Kit forum.

Jason