I have the GPS60 which the next series up from eTrex. A friend has had one for many years and he uses it offroad and when flying. They are a good and popular model. I looked at the eTrex and was going to purchase one but I had to go overseas and ended up buying the GPS60 for the same price with extras for Amazons.
The only thing is to check which eTrex model has the features you want. The GPS60 series comes with the Garmin software where the eTrex is a extra purchase