Sadly, burkhard's expreience sums up our own. We got one in at work for our software development team to look into - after a few hours playing with the provided examples, it went into a drawer, never to be seen again, without so much as a line of 'integration code' being written.
Even in the videos, you can see how slowly everyone does everything. It looks like it ought to be intuitive, but everyone's opinion here was the same - you seem to need to develop some kind of special motor skills that don't come very naturally (hopefully before your arms drop off from fatigue!). The idea is really sweet, but the actual experience of every single one of us was "gimme my mouse back!".
One has to wonder wonder just just how much practice the demonstrator's had, and how many takes it took to make their marketing videos!
As you say "pushing the boundaries", and surely the technology will improve.
However, consider this...
'Gestural' technology is not as new as all that. The Theremin (wave your hands in the air musical instrument) is getting on for a century old. Moog had a good stab at popularising it, it was used by many composers (lots of cool sci-fi movie soundtracks especially!), and they're cheap as chips to make. Yet, theremin players are rare as hen's teeth - and ones that can play in tune and expressively rarer still!