I've been riding with the mitts since my first season. I haven't had a bad fall since I got them. Lately I wear them without the inserts.
They were plenty comfortable, just got tired of taking the inserts on n off. I didnt like the gauntlet style warmth liners they came with, but most of the time I didn't need them. This season I bought a pair of fleece glove and I wear them inside instead. Even in double digit, sub zero temps I've stayed warm. (...well, my hands did anyway!)
They will not last long if you're using rope tows in the park tho. I have a small abrasion on the palm from my first week riding and using the rope on the bunny hill. Since then, no more ropes n hole hasn't gotten bigger.
All in all, 3.5 years and I still like them.