My 315 works great, the last cache I found it got me within just 15 feet with the new v3.15 updates. This unit has everything you would ever need to get started in this hi-tech sport. I purchased XpertGPS software for topo mapping and works great, but you will need the serial port / liter cable. Get the cable, you can run the unit off your cigarette liter and save battery while driving. Magellan DateSend CD also works great, you have the choice of around 44 categories of POI and store up to 10 different categories in the unit, if you are traveling on vacation you can load exit ramps, service stations, hotels, campgrounds . . .
Like Logscaler said, great for hunting, all I do is bow-hunting, get out several month before the season starts and enter waypoints for tracking deer for several weeks and load them into XpertGPS http://www.expertgps.com/purchase.asp I can see ware the deer travel on a topo map and see ware I want to place my tree stands.
The bottom line, I cannot say anything bad about the Magellan 315, it’s a great unit.
xpertgpa has a 14 day free trial ofer, try it you will love it.