most the time i can pick out an ultra without a problem. i can pick out a sportster - usually. after that - i really have a had time telling which is which. and then of course there are times when i have even been wrong as to whether it is a HD or not. obviously, the closer i get the more certain i am as to it being an HD or an imposter. any body out there (except for sales people) can pick them right out by model?