I recently picked up an IDM .21 for on-road. I am extremely pleased with the motor (actually, pleasantly surprised). The motor had a strong and broad powerband, held its tune very well, and had decent fuel mileage on top of it all. Nice job IDM.

Also, the support and input I received from Jerry at xspower has been second to none. He definately cares about the product, AND the customer. Thanks Jerry!