I've had a 705 for 2.5 years or so and have been looking at the 800 ever since it came out. For me, there is no identifiable reason to switch. It offers nothing in the way of performance of operational features that would be of value to me, and the poor screen contrast is a real negative. It's taken me a while to figure out and learn to work and live with the 705's bugs and idiosyncrasies and the 800 would simply be trading those for new ones. I plan on waiting until the next version comes out, a competitor comes out with something better, or my 705 goes TU.

Check out the Garmin's official users' forums for more info: https://forums.garmin.com/forumdisplay.php?f=20