I don't own a MILES, but I do own a ZENN, which handles very close to a MILES.
Honesty- the ZENN won out of sheer cuteness..plus the fact that my boyfriend and I have no kids, so no need for a four-seater.
*That said*: if I DID have kids, ergo a need for a 4-seater, I *would* have bought the MILES in a flash.
It felt like a regular car , but with out engine noise, was able to haul around myself, my boyfriend and Steve Mayeda from MC Electric Vehicles up and down Dearborn St on the Hills at 25-35 MPH..., was easy to park, had adequate torque, etc.
The ZENN handles the same- a little better, as the car is slightly smaller and closer to the ground, thus a lower center of gravity, but I liked the MILES just fine.
I think the answer is to go and test drive the thing multiple times, with different configurations of spouse and kids- be a driver and passanger and see how it feels.
Next, is to spend two months (I spent three) keeping an honest log of when, where, under what conditions, with whom in the car and how many miles a day you are using your gasoline vehicle.
It was the logging and honest look at my daily/weekly/monthly driving patterns that told me for sure,that I *would* be using my ZENN heavily... which has come to pass!