My booster has the mx500 and I have utilised it many times and whole I may pronounce is it is great. It has smooth acceleration and is near completly silent. It is powerful enough to have a 120 pound rider up a reasonably steep Razor MX500 Dirt Rocket hill. For older riders, I would propose the mx650 because it is more powerful and may have yo up some jolly steep hills, thus, you could actually utilization it off-road.
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