The safety factor and the riding experience (almost like gliding) make it appealing to me, but I feel this bike is also hopelessly compromised:
*looks (first and foremost): I just don't like it, especially from the rear. There's much better-looking scooters out there, for instance the Aprilia Scarabeo 500, the Yamaha XC300, Gilera Runner 500... The electric Vectrix posted on this site looks much better as well. Almost any redesign would be an improvement.
*comfort: I'm 6'1" and while it's not a dealbreaker by itself, the seat is a minus. What idiot at Piaggio designs these things (same issue with, for instance, the Vespa GTV)? Also, I have size 12 for shoes and can't put my feet flat in the allotted space (I have to curl my toes up or point my feet outward). Even if I were to spend more money (as if it's not expensive enough) to get the seat redone, I fear that then the handlebar may be too low for comfort.
*resale value: I'm an expat and will probably move to another country in 2-3 years. As with any high-tech product, you start with high price at the beginning of the product lifecycle, and gradually move down. So above normal depreciation, you lose the price premium you're now paying.
All in all I have to say though that my first point is the main thing holding me back. It just looks nerdy and unstylish, as if they've outsourced the design to China. I hope that Piaggio or another company (maybe the Japanese are working on this?) will come out with better-looking scooters with this technology. The Gilera Fuoco would be better already (although I'd prefer something more elegant), but that's not available where I live. Seems like I'll be riding my motorcycle for yet a while.