Regarding latency over wireless, its absolutely fine for casual typing and office/web use. However for gaming, my relatively new wireless keyboard and mouse (bought for casual use when I plug my PC into the TV) are pathetic and extremely slow. Accuracy is laughable. I suspect even some of the faster typists here could run into issues like missed key presses. Maybe I just got a really dopey keyboard and mouse?...
Still if you're not typing at light speed and gaming in fast paced games, what's the issue? I like the look of the Filco Minila Air, though I think I'd buy the standard Minila first.