ORIGINAL: rob1
To be honest, I have never used one. I have been looking at them though and was kind of interested in the Garmin 120. It is a GPS and a two way radio both. I don't know much about it though, as far as if it would be the right choice for my needs etc. Maybe someone else here has used one and we can both learn a little about them!
Well, long story short, I found myself lost in the mountains of Va. last season, in the dark. I had a radio and a gps and let me say these things eat up batteries, it's good to carry extra's. I wouldn't want my gps and radio dead at the same time, besides 2 unit with the same batteries means one can operate both if need be. It' also easy to drop things in the woods and damn hard to find at night so don't buy the camo model. Get one that's reflective or make it that way. Hasn't been that log since then but I look back on the experience with a smile. I don't recommend getting lost in the mountains but if you do, and make it out, it makes for a great story.
These things are great. Set a waypoint in the summer and come rite back to it in the dark next november. All for around 100 bucks. It' a blast.