I have experience with only one. I could give you the long story, but here's the short instead. After almost 3 miserable seasons of use, in a fit of childish rage at being out of juice for the hump-teenth time (this time 3 1/2 miles from camp in a driving rainstorm), the owner pushed it off a 20' bank into raging creek. He had experienced pitiful battery life, a motor winding short and a battery fire. I think it was a 2007 vintage BB Buggy, but not 100% sure.