Still waiting for my TestTube so I can't report back on the Blinc mascara yet. But what I have been using for a long time, especially on long flights, is Revlon ColorStay Overtime Lash Tint. It's not as lush as many other mascaras but it does darken the lashes, and I no longer get off a red-eye looking like a raccoon. It holds up to sweat if you wear it to the gym and will stay put for two or three days if your itinerary demands it. Even my usual waterproof mascaras (Almay, Mabelline) will smear some--this stuff, not at all, never.
BTW BaliParis, you're right about the TestTube. With all the full-sized products it contains, even with the inflated shipping fee it seems worth it. Not the magazine, though, which seems to cover mostly cosmetic, er, "procedures". I'm old enough but way too squeamish (and scar-prone) to contemplate knife or needle (shudder)...