I'd LOVE to have one of these...My Garmin is 2 years out of date, and now with a 4.3" screen, I have no reason to leave this laying around. I've been looking for one of these even though it probably won't be compatible with my Seido Innocase II Surface.
Still, as a storm spotter, it would be ideal to be able to program our watch points into google maps and then get turn by turn directions to exactly where I need to go while in a storm allowing me to focus better on the storm and less on making sure I get all of the correct turns to watchpoints I haven't been to before.
EDIT: Just realized that live traffic info in Maps will make it even more helpful since most of our storms come around 5 when everyone is heading home!