I have a 60C, a Dakota 20 GPS, and a Palm Pre 'smart phone'.
I fine all three have pros and cons.
For ease of use, speed and bigger screen I love the 60,
the limited memory is a drawback. should get a 60CSx
The Dakota gives me paperless caching but small screen,
not too bright and slower to operate.
The Palm Pre with Geocaching for WebOS is great.........
as long as there is WiFi or Cell service. I love being able to
search any area I am in and see what caches are around that
I have not found, read all the info and logs, to be able to
find one and log it right on the spot. I think it is slow and
it is not too rugged but it has a place in my heart.
I think 'smart phones' will outnumber GPS units for the
game in a few years unless the GPS makes big moves in
two way communication, sort of like the SPOT.