Just got one, and a few questions/concerns: About how long does it last? Is it okay to leave it on at all times or should I toggle the switch as often as possible? Anyone notice some lag when typing in Word/Safari's address bar? As I type this thread I notice no lag, no lag in Adium either, and when I tested it at the reseller it worked brilliantly with the address bar (albeit this was with a 24" iMac, mine is a G5 1.8). The lag seems to minimize the more I use it. Is that normal? Thanks!