I just opened the package with the beta unit. I first set it to my desired levels (4 and 7), cycled it through some of the menu options, then dropped it 3' (6-times) onto my cement porch floor. Three of those drops were a direct hit on the switch side. I tried all the critical functions (setting the modes, double-click, double-click, triple-click and hold). It's still working well. The feel of the switch has not changed due to the falls.
I actually like the new tension of the switch. I don't find it too hard to press and it has a much better "secure" feel to it.
My next step was to ask my wife to walk across the street where I was to play a game of catch. We performed 3-series of passes back-and-forth, of which neither of us caught the light with each toss. That's (6) times where the light was thrown ~15-20 yards and landing directly on the pavement each time. This unit looks dented pretty good already and I haven't even had it for an hour yet, however it's working fine. I'm going to play around with it some more tonight, however it currently in the freezer cooling off. Assuming I can't break this light, I'll be testing it over the coarse of the next week or two.
My final test will be to tie this Arc4 to my bumper and drive with it dragging, scraping and bouncing the ground for 1-mile.