In principle it's a great idea but from the picture it looks like they're monopolizing a shared resource. This isn't fundamentally different than adults parading around during Critical Mass.
In my opinion they certainly bring the fun factor, but regarding efficency they offer no real advantage over electric mopeds, especially when riding them with a passenger.
Electric mopeds are amazing, best way of transporting yourself in a city when the weather allows. It has all the benefits, the only downside is that you can't really use it in rain or snow.
