I have been using the Garmin eTrex Vista HCX which is the upgraded legend (altimeter and electronic compass) for about 6-7 years now and have had no water issues. I use the garmin handlebar mount so the unit is right out there in the elements.
I use the legend hanging on my backpack strap. I use it in the snow, rain, wind, subfreezing temps. Never had a problem with the unit working. Its a little small for viewing and buttons a bit small for gloved hands but it has saved my life a couple times.