I use a couple different handhelds for various reasons... and just picked up the Montana 750... its huge but also in the world of GPS... breathtaking...LOL
That being said... my 64ST still seems like the easiest option when it comes to doing Geocaching... although once I get through some more of the learning curve on the 750 that may change... so far the size and weight for me is vastly overshadowed by its "awesomeness"....LOL