I've used both Garmin and Magellan. Some of my first Geocaching adventures were done with a Meridian Gold. The Meridian seemed to perform very well... at least compared to my cell phone GPS that I had also been caching with.
I found my caches no problem at all... The problems I did have with it were linking the thing up to the computer. Sometimes it worked... most of the time it did not. I had to transfer waypoints and maps directly to the SD card to get them into the unit. Streaming NMEA data seemed to work fine, but connecting to load or unload data was just plain out.
The other issue I had was with thick tree cover... The thing just didn't cut it as was the case with almost every other GPS on the market.
After some research on the features I wanted, I purchased a Garmin GPSMAP 60CSx. I was mainly looking for a more sensitive GPS unit that could handle the heavy tree cover and would be a reliable unit. I have to say that I love my new Garmin and wouldn't go back to Magellan.
Aside from a few minor quirks in the unit, it perfoms exceptionally well. It has all the features I wanted... USB connection, Expandable memory, external antenna connection, feels comfortable, easy to read, fast lock and exceptional reciever sensitivity!
The SiRF III Chipset is just beyond compare... I can maintain a lock on 6 satellites in my upstairs bathroom... mind you, there are no windows in there.
BTW... 12 channels vs 14 channels does not necessarily mean better reception... it just means that if 14 satellites are in view of the antenna, the unit can get a little better accuracy... a 14 channel reciever does not even compare to the high-sensitivity SiRF III chipset. They are not even in the same league.
Slewfoot