We noticed a minor amount of lag with the live video stream but the controls (shutter, zoom, flash, timer, image size) were quite responsive.

ENGADGET: Samsung Galaxy Player 4.2 remote viewfinder hands-on (video)

Now, we can live with a browser or Google Maps with no pinch-to-zoom, but not having a hardware keyboard hamstrings this device in other ways.

ENGADGET: Nexus One review