I have the basic Garmin Etrex which I use for geocaching. Geocaching has taken me places I might not have gone otherwise.
I have placed several caches myself and plan to place a multi-hydrocache soon on several islands at Lake Fork. One bad thing about geocaching is that the cache contents are degraded fairly quickly due to uneven trades.
I did use the GPSr recently while backpacking on a trail I had never travelled. I was able to tell how far I was from certain features along the trail. I visted
www.travelbygps.com before the trip and downloaded the waypoints to various features so I could find them while hiking. Kinda neat, but in my opinion, its just an expensive toy.