Before you buy one, ask how accurate they’re guaranteed to be. Back when I bought one they said worst case was 30 feet. I was going to be ok with this, but for the most part it was within a yard of my trail. You’ll find that they under-promise and over-deliver.
The only problem I have with mine right now is that I bought it when I was in Tucson (no big trees and could always get line-of-sight to multiple satellites) and now I’m in Seattle. When I hike I’m usually under a big canopy of trees in a valley between some steep hills and it take a while to step out into a meadow to get line-of-sight. I still enjoy it, but you want to know as much as possible about what you’re getting and what it can do for you.
My husband got me this book a few christmases ago and I really got a lot out of it. It explains a lot about GPS and orienteering in a fun way.
If you have further questions, feel free to PM me. Cheers!