Summary: I use this a lot out in the flat woods where I have no land marks. It is a good simple track back. Map is not real great but can be updated or by a different map for your area. This gps keeps it simple ! Doesn't have all the crisp you don't need and most of us don't know how to use anyway. I use this over my amazing Garmin Colorado all the time. Track back is 90 percent of what you do with a GPS and waypoints. This does it perfectly and is simple to use.
Summary: We bought this to measure acreage on our farm. We lease a lot of land and need to know what we're paying for. We first tried the Garmin Legend H. It was far too complicated for what we needed. I called Garmin. Immediately the rep recommended this eTrex 10. It had a selection for "area calculation" that was perfect for what we needed. Press start. Drive around the field. Press calculate. Simple! Couldn't tell you about the other features as we don't use them.
Summary: I bought this for a recent job surveying water systems in Central American highlands. My requirement was for a reasonably priced GPS that could export tracks, waypoints, and data for preliminary engineering calculations. The eTrex 10 was just the ticket.
Summary: Redundancy is very appropriate for cruising long distances, and this was purchased as a backup to my Furuno navigator, along with several other handhelds. My wife had a very old eTrex with a display that finally degraded to a point it became unusable. The new one is MUCH faster to lock in, and display new information. It is excellent for what it is, that is an inexpensive unit dedicated to specific needs.
Summary: I feel the etrex size is too small to really take advantage of terrain maps both in detail and scroll speed, so for hiking, simple open water navigation or backwoods purposes, an eTrex 10 is all that I need to complement a compass and paper map; I use it like old style radar, follow the blip to a target using whatever route you visually survey is best.