Thanks - very thoughtful response! I have been burnt before, so validation is definitely #1 priority for me. I'm still in the wire-framing phase, because I at-least want to take these screenshots with me when I talk to the golf courses.

But my problem is that of segmentation - I don't have the bandwidth to support both iOS and Android at the same time, which cuts off a big chunk of audience.

Since the core of the app is networking - supporting the major platforms is quite important. But hey it is what it is. I've gotta start from somewhere!