Got a friend that has one of the other Xprotolab's. The thing works GREAT for what it is. We don't expect it to measure a 10Mhz sine wave or catch a 1ns glitch. We've got other tools for doing that. But, for the $$$, the size, the power consumption, etc.etc.etc., it's a great tool to have around.
Now, whether I'd actually use one in a wristwatch form factor...well, probably not, but as was said a couple posts ago, the fact that the whole thing is jammed into the watch body does deserve some cool points.