For me, it's being able to quickly carve up a big piece of material but not have to devote an entire room to a CNC machine.
The thing that I didn't see in any of their videos is multi-tool use, or complex 3d carving of the material. It's still essentially a 2d process.
With the handibot as long as you are careful how you move it, multiple passes can be made to a piece.
I'm still interested in a device that can re-register as it is moved, such as burning new reg marks as previous ones are removed in the cutting process with a laser. Final 'finishing pass' removes all trace of reg marks.
Maybe a wax spray could be used to lay down reg marks?
I noticed a 'pen holder' attachment in the store. What if the handibot first pass was with a piece of chalk that mapped out reg marks on the material.
The Handibot reads the marks and uses them to cut. Once it's cut, it uses what reg marks remain to draw new reg marks on the newly exposed material (a bit of chalk could be draw over a 3d surface).
Then the 'bot' uses the new reg marks to continue cutting, maybe with a finer cutting bit.