Never rode or built one personally but I see people on them all the time here. Honestly the coolest one I have seen Is one this guy built with a weedeater motor. I bet it would be cheaper to do that I would look into that.
I have been, but i saw a kit for about 200 dollars and it was a 80 cc engine, and that would be sick. i'll probably have to go with a weed eater motor because its cheaper