Summary: The Etrex series is obsolete and this is not what real GPS geeks will want. Examples of archaic features: it comes with an RS32 nine-pin serial pot cord which - useless with a laptop and it is incompatible with map data cards. I bought one used/cheap because I am familiar with using the Etrex and moreso because I only want the unit to do two things: 1) give you a position 2.) give you a heading. This is fine with the paper maps I still use. Yes, they still exist.
Summary: I've only used the Garmin eTrex Venture GPS unit for about a week or so, but it seems to work great. My sons like to geocache, and there have been several that they could not find over the years, but once we got this GPS system... they found their geocaches easily. The other good thing is that they're 12, and they figured out how to use it very quickly. Good buy!