The only thing I don't like about the SM is that the battery is so bulky that it reduces my cargo space significantly. Also, on the flats where I don't really need the help, it adds a significant amount of extra weight, but that means that I get that much more exercise when I'm out with it.
I have gone up to the top of the Edgewood ridge and up Greenbriar Street to Coonskin Park on it; after that, I can say that there isn't anywhere in the county it can't take me (provided there are decent roads, and if I put on knobby tires, perhaps even there.)