I've got one, what do you want to know?
In general:
stone axe simple two stroke engine dating from the 1960's era.
suspension is adequate for a 165lb adult to trail ride, but it's a little short on travel for serious jumps or landing wheelies hard.
brakes are decent for drums
gets great mileage
mine came with parts missing in the speedo gear drive in the front wheel and charging system
on really cold (as in colder than florida) days it doesn't stay warm enough to run off the choke.
top end is 62mph, but it really prefers 55
kinda loud
Good bike for getting around on and light trail rides, but nothing that a more reliable, less maintenance prone air cooled honda can do. Other than for the street legal aspect, I can't see why anyone would want a KE100 over one of the better 125cc honda clones out now, and some of them are street legal...