I have a Montana. Yesterday I did a 13.5 mile walk (picked up a couple of caches en-route). Most of the time the Montana was set to view the map and was in a pouch. I just whipped it out from time to time to check progress/time/distance. When I got near the first cache, I changed to Geocaching mode, to show distance to the cache, etc and hand held it. I have a short lanyard with a clip on the end; I slipped the clip round a finger, so it was "tethered" to me and held the GPSr in my palm. Very simple and it fits snuggly with the thumb on one side and the tip of the fingers just curled around the other side. After finding the second cache, it was just a couple of double clicks to the power button, to return to the Recreation profile so I could again show the route mapping and data. (Shortcuts on the Montana and Oregon make it very simple to switch between modes.) In summary, the Montana is a bit bulky, but IMO the larger screen size is a bigger "plus" that offsets the increased bulk.