I almost flipped over.....
The belt had 500 km more before replacement...
I drove 40 km/h on the road and suddenly the wheels of the 450 blocked totally and the machine almost flipped over from behind. A few centimeters more and i had the quad lying on top of me. Luckely it felt back on 4 wheels.  Tranported the machine to a mechanic and the belt was sheddered totally...
My advice, look regularly to avoid breaking your neck