Had one for 2 weeks.
From my personal experience, the novelty wore off really fast. Yeah, it's cool hearing that gyro spin up (for quite a long time, i want to add), once or twice. It's also cool seeing the thing go down the road and wheelie, once or twice.
And then.. well... yeah. That's about it. They are pretty flimsy, so while you can jump them, you're almost guaranteed to break it where the fork connects to the rest of the bike (i can't remember which reviewer it was, i wanna say RC Driver, broke it on the first drive there as well). Completely unusable in sand (i live near a beach), needs a large empty space with maybe a tiny jump, either concrete or dirt as long as there are no ruts etc.
Dunno.. Wasn't for me. Twice or so was fun in the parking lot doddling around, but then got old quickly. That said, i'm not into bikes, so maybe someone else gets more out of it.