I have the
Garmin eTrex . I use it almost exclusively when I ride my 4-wheelers so that I know how to get back to camp or the truck. I absolutely love the Route feature which leaves an electronic breabcrumb trail of where I was and how I got there. I first bought a low end Magellen, but I didn't want to think too hard and rely of marking waypoints and using a compass. So I returned it after some research about the eTrex line.
I didn't need it for any kind of any road maps or travel by car which is what the more expensive ones add feature-wise. I just need to know where I've been, where my campsite is, and how I need to get back there and the routes on eTrex were the easiest for me to use and understand. If I wer eso inclined, I cold use it more typically with a compass and mark more waypoints, but it serves my simple purpose.
On Garmin's site there is a handy product comparison. If I were to buy another one today, I'd get the Venture, though. About $150 from Amazon and $45 more than mine, but the WAAS, higher resolution LCD, and click stick thing would be of value to me. The only real greif I have with mine is that it doesn't allow scrolling in the map mode. I can zoom in and out, but when I zoom in, I cannot scroll to get some details.
I also have a 12V DC adapter that I have wired into my 4-wheeler and a handlebar mount.
www.garmin.com has a lot of information about GPS's in general, as well as detailed information on their products (even users manuals).
Aaron