I've only ever used etrexs on the bike and would recommend them - depending on your eyesight!!
I used to be able to read the screen easily but now, not so much. I gotta use cycling bi-focals to see the etrex now. PITA.
But, the etrex can be used on the fly, in any weather, with any gloves.
I certainly wouldn't change it for another one now as I'm getting to the end of my adventure career.
I have the 30 right now, bought through a 'special' a while back, but woulda bought the 20 if buying off-the-shelf.