I posted a new thread over in the NE regional about my experience with VBike, but to summarize: not bad.

Single speed, seat not adjustable. Tires we not as bad as I expected. I did about 4 miles, and was reasonably comfortable. Front and rear lights, with no capacitor/battery, so on only when bike was moving. Because of the lack of gearing, would not have been able to tackle any serious hill; a slight uprise was okay.

The app worked exactly as intended; I added (recharged) the account for the first time right at the bike, $5 was the minimum credit to apply, or $15 (intro sale, regularly $20) for a month of unlimited rides. Holding the phone next to the lock unlocks it. $1/hr, and when done, just manually slide the lever to lock the bike, and done.