I agree, they are massively fast off the line as the torque is from ZERO. I am not sure if they run through a gearbox but my leccy bike does not, it accelerates like an 80cc to 125cc motoX bike up to about 25/30mph but then takes a while to do the last bit as the motor is at max revs then. It pops wheelies just on the throttle under 15mph. It can perform like this for about 40-50miles depending on the outside air temps but then dies off like it drops off a cliff as the batteries have a computer to see when they hit critical and it then just cuts it dead to stop any dammage to the batts.

These battery ECU's consume a small bit of power and people do not realise that if you leave them standing for a month or so it can kill the battery as the polarity reverses and then when you charge it the cells pop. the chap I know with a MAC P1 was told that if he lets it go below critical then it is £250,000 for a replacement battery!