Mine seems to work fairly well. It do notice that it's a little behind while driving....up to 1/2 a block at 35-40 mph. If you pull up directions it won't pan along with you. You still need to manually move to the next waypoint to get the directions. On the 8100 the GPS automatically starts if the puck is on and ready. It would be nice if it tied into the directions a little better but this is a huge step forward. Lovin' it.