I have an older Oregon model which has served me well for a couple years now. Overall, I like the unit, but there are a few quirks that bug me:
1. The display can be hard to read under certain lighting conditions. It's actually great in direct sunlight or with no sunlight, but cloudy/shady conditions make it tough to see... especially if you're wearing polarized sunglasses.
2. Also, the touch screen tends to get scratched easily... still works fine, but mine is pretty scratched up (then again, I've been pretty rough on it).
3. The touch screen often activates in my pocket... which drains the battery. Also, unless you lock the screen each time you put it away, you can find that you've inadvertently made several changes to the display when you pull it out again (I've had multiple custom fields change on me). I imagine most/all of the new touch screen models have this problem.
Otherwise, it's very accurate, finds a signal fast, and has lots of great features and customization options. Also the touch screen works well... even with gloves on.
I've also heard good things about the newer GPSMAP 62 line (rugged, bright, etc.)... but they are costly.
If you go with either of these options, make sure you select one with a "t" extension (it will include detailed Topo maps of the entire U.S.).
I'll add that one of my hiking partners, like Chris Roberts below, also has a ETrex and loves it. The screen is a little small, but it is very bright and he wouldn't think of swapping it for anything else.
Finally, click here for the thread about loading summits en masse from Lists of John (They are loaded to your unit as Points of Interest (POIs).)