Personally, I think that, potentially, this could be very good indeed.
If the inventors claims are accurate i.e. that complete beginners can ride this thing in a very short amount of practice; then it’s clearly going to remove the single biggest obstacle to unicycling- assuming, of course, that the skills acquired from riding it, translate well to riding stanard unicycles.
I don’t think any of us here, can necessarily offer much comment about the lunicycle based on our extensive experience on unicycles, simply because the lunicycle probably doesn’t handle anything like a seated unicycle- unless and until we actually try out a lunicycle.
It’s an easy assumption to make that a lunicycle will tire out legs, as we know what an effort riding an ultimate wheel or seat dragging a unicycle feels like- but, again, the lunicycle isn’t either of those things.
Riding an ultimate wheel or seat dragging a uni involves tremendous force to keep the wheel vertical- countering that force can only be done via the legs, which is probably a big factor in them getting tired.
On a seated unicycle, that force is countered by the seatpost/seat being held vertical. On a lunicycle it’s countered by the calf pads. I don’t know how that feels, having never tried a lunicycle, but it could well be that it works like the seatpost/seat on a standard uni? In which case, there may well be a lot less strain on the legs that you’d expect.
Certainly, when going up a appropriate incline on my seated unis, such that my weight is off the seat almost completely (but the post is still stabalized by the thighs), leg strain seems not much more than if I sit down on the same incline.
If the lunicycle is a goer, it’s quite exiting to think of it being scaled up to a usable commuting wheel (26/29) because then you’d have a usable device that is considerably more portable and light than a unicycle with a seat, and which lacks the necessity for the considerable amount of training required to master an ultimate wheel.