Full review...
Positives: Fun (but, could die)
Negatives: Could die (but, fun)
Rating: B+
Though if I'm being honest and having realistic expectations of the Slingshot, the only complaints I had were the price, and the brakes. The brakes seem very underpowered for something that size. You can argue about the storage space, daily practicality, "value", but it's a toy and that should be your expectation going into it.
You should be demo-ing used minivans if you're looking for something practical.