From Space Cadets
Positive:
1) Great satellite reception, even in heavy cover.
2) Excellent user interface with some geocaching specific features
3) Extremely versatile (I personally use it for geocaching, mountain biking, boating and road navigation)
Negative:
1) The price (although you get what you pay for)
2) The documentation could be a bit rudimentary for first time GPSr users. They should provide more real world examples. Some features are referenced to pages that don't exist.
3) Limited Macintosh support for Mapsource software that you really want to use with the receiver.
Honestly it's hard to limit myself to 3 things I like about this GPSr. I've owned many units to date and this is like a dream come true.