I stopped using my near new at the time Garmin Oregon four years ago when I got a smartphone. The way I use it, my battery lasts between 2 and 4 days, depending on how much reading I do. I have both a booster pack and a spare battery (you can swap them with my S4).
Where I use it, it connects faster than my Garmin's have and is at least as accurate. I find it easier to use across the board, it has a much better screen, awesome maps and land ownership for free or cheap, and I'm carrying it anyways. I'm running Backcountry Navigator, for Ios Gaia seems solid as well.
I'm not switching back, that's for sure!
