A quick test with my N1 and MiKey and have had positive results. The button seems very responsive even from a light press. No issues with multiple clicks and long press (at this early stage).
Currently set as a single click to open Ingress. Works like a charm, now I have one of my fav apps at the single press of a button. I like the fact that I don't have to first turn on screen then unlock then open app.
Will continue to play around and feed you any further results.
mine arrived. Worked fine with Galaxy S2 with Cyanogenmod 11 But the button need to push pretty hard in order to work and the software need a bit more work. Still a great little device. shipping is a bit slow But emax should not use "firstname.lastname@example.org" cause i have no idea who this is at the beginning thanks emax