Looks like a pretty nifty device, Buuuutttt I'll just wait for a gemmacert knock-off to come out, that doesn't cost $2500.
...or figure out how they built it, and make one for myself.
*edit, added content*
From the brief reading I just did, That product doesn't seem like it'd be very accurate, Since, to my understanding, You have to calibrate this type of instrument every time you use it, By using other traditional means.