At $200, it's not cheap. Neither is replacing an iphone because it got wet or dropped. (I know several cachers that have had untimely replacements of their beloved handsets.) Adding (or improving) a GPS and doubling the battery makes it a more practical geocaching device, too.
http://gizmodo.com/5559670/magellans-in ... msy-people
There's a little plastic shim inside for the Touch and 3GS which are a little thinner than the originals. I imagine that's how they're doing iPhone 4, too, if it's similar in size in the other dimensions.
