I love Garmin's stuff, but I must say that their business decision to produce their own phone was a bit misguided (even when they started the project they were a bit late to the party).
Now Garmin will be late to the iOS party for GPS. If Garmin was one of my choices 15 months ago, I probably would have purchased their app based on familiarity with their interface. They are going to have to do something really unique to get me to fork over a load of cash when I already own Navigon's app.