Summary: My Garmin GPS IIIs (I have two) were growing a little long in the tooth. I knew the new Garmin devices had much better lock-on times and the four AA batteries in the "III" don't last long. I also wanted something smaller and lighter. So, I bought a Garmin Dakota 20.
Summary: I bought this GPS after searching through options based on price and availability. I can honestly say I feel I made the right choice. Having never owned any GPS automotive or otherwise this thing was a little tricky to learn the ins and outs.
Summary: When my previous GPS, an Etrex Vista CX, was so badly beat up that it was unusable, I had to get a new GPS. After some detours, I ended up with the Dakota 10 and love it. I use the GPS for biking and driving, and occasionally for walking.
Summary: This is the first handheld GPS I have owned. Took it hunting last year and it was very easy to use and was extremely useful. Screen is pretty small, so I found myself zooming out frequently to try and figure out where I was at. Touch screen is not terribly responsive but you get used to it.