Hard to comment as in the uk it would be illegal as over here they are limited to 15,5 mph , any faster and they are classed as mopeds with the need for insurance, appropriate driving license, VED , mot ( including the need for lights , reg plate etc etc ) .A lot going on in social media as the police are finally doing something about them.
If it meets the regs in your country , im guessing usa ? then a class 2 e bike should be limited to 20 mph although class 3 ones are legal but need a helmet but it is pretty sketchy dependant on which state your in !
Hey if its legal for you then go for it