It's like a Boosted board, but a lot cheaper and more efficient as it uses hub motors rather than a drive, so there is less energy loss. My fear comes from the first day I rode one, it catapulted me into the air and when I landed fractured both my wrists, probably one of the most painful things I have ever experienced, I was lying on the floor laughing hysterically for ten minutes to overcome the pain and my right hand swelled up to twice its normal size within seconds, believe me, not pleasant.
As you know have moved on to electric scooters now, so much safer.