From Babybackpackers
Positive:
1) Built in PDA and GPS functions work together for an unbeatable geocaching experience.
2) It can store as many waypoints as you want 10,000+
3) It supports a 4 gig card! (You can put all of North America and more on there.)

Negative:
1) Built in battery. (You can't replace those batteries on the trail)
2) Non water proof and not as rugged as other models.
3) I keep losing the stylus.