I just recently purchased two 650 joyners. one is stock the other is turbo'd. They ROCK!!. fit on the trails that I ride my quads on pretty well. they are slightly skinnier than the BMS and have good accel. The 800 cc joyner was wider than what I was looking for, and the 250's were dogs, that is why I chose the 650's. I found that they climb well, work good on the technical trails and sand dunes. i am very happy with my purchase and would recommend them to others. My dealer said that the BMS buggies are getting better but have alot of breakage issues currently. Not to mention the joyners look pretty cool, as cool as the BMS in my opinion. good luck. RICK