This was my first year with the Oregon 450. My first upgrade from the Garmin 12XL, so big difference. With the 12XL I would mark where I parked, camped, and where my elk was , turn it off and never look at it again. Only one time did I use it to get me to where I needed to go one night (long story). I really don't need the 450 any more than the 12XL but I get a lot more use out of it. Find an address on Google maps, download the position to the Oregon 450, and it will give you turn by turn instructions on how to get there. Sync the time with your camera, save the track log, and software available on the internet will assign GPS coordinates to your pictures. With the heart rate monitor it will record your heart rate to the track log. Love the maps, which were all downloaded from the internet. You can also make your own. gpsfiledepot.com has been a big help.
Battery life is way better than the 12XL. The 12XL could go through 4 AA batteries in a day if it was on. The 450 can go for three to four days on two AA's, but all I usually do is just turn it on, lock the screen, and put it away. Change screens a lot, use the backlight a lot, and your milage will vary. The best batteries I have tried so far are the Energizer Ultimate Lithium AA. Tried rechargeable. OK, but they go pretty quick.