This watch can do a lot of stuff, so it takes some practice learning all of the functions and menus.
GPS signal acquisition is slow getting locked in initially but then maintains the signal well. Obviously, you can't take it in dense trees and expect the GPS to still work.
The battery will last about 3-4 hours in GPS mode at 1 second update intervals. If you remember to power down the GPS when you don't need it, you can easily extend the battery to last on multi-day trips. I primarily use just the altimeter mode and don't need to recharge the battery for weeks.
The included software is OK for looking at altimeter logs, but not much else. The good thing is that you can export the GPS logs into Google Earth or your topo software.