Beta testing is part of our DNA... there was a group of boaters using this app for months before it shipped, in many different cruising and sailing scenarios.
We shipped the first version to beta before we had built many of the features. We also get some broader test data from beta testing Gaia 8, though that doesn't help with design so much as QA.
I saw Nobeltec just released an iPad app where they drape NOAA raster charts over DEM data to get a 3D effect. I think we could whip up that feature pretty quick, but do people really use that a lot?