From what I gathered on the website, it seems they put the deposits into escrow and you can claim yours back whenever you want, if you wish. If you don't mind waiting, it'll be pretty cool to own one of these things when they do hit the market though.
I'm no expert, but aside from the initial spin-up of those gyros, they shouldn't use much energy. I'd be surprised if they're not sealed units where the flywheel is housed in a vacuum. With the right bearings, they might keep spinning for hours on their own. I love the idea that the regen goes into the flywheels. That should be more than enough to keep them spinning when on the move.
From the video, the gyros did seem to make a fair bit of noise, so that may be a concern. That was on the early prototype though and I'm sure they'll do something to reduce that noise in the cabin.
I wonder if the flywheels charge the battery when you park and switch off. It would make sense to drop all that energy into the battery for long term storage instead of just letting it dissipate. I imagine the gyros have to spin down when parked for any length of time for noise and safety reasons.