I've had my Jam2 plus for 5 months now. ticked over 2003kms last night. On my second chain (soon to be third). replaced both sets of brake pads. Bought a new rear tire today which I haven't fitted yet. Ride a variety of Road/Fire breaks/Single Track and generally some pretty steep hills. 58yrs old, 114kg and give this thing a fairly hard time. Not one single problem and its the most fun I've had on two wheels in years (that includes my Harley). Never had a problem charging the internal battery or my TEC pack. Absolutely no regrets about my spend.