Im watching the output of my Kona 3 on my external monitor. No lag at all. Cuts in both the Premiere Program monitor and the external happen simultaneously. Audio is in sync. No audio issues at all. Mac user be sure your Prefs / Audio Hardware is set like this...
Tom Daigon
PrP / After Effects Editor
http://www.hdshotsandcuts.com
Mac Pro 3,1
8 core
10.7.3
Nvidia Quadro 4000
24 gigs ram
Maxx Digital / Areca 8tb. raid
Kona 3