I've used it a bit more now and find it a bit better. I found a GPX file that didn't contain any (0,0) coordinates and it drew a nice line for me. Adjusting the slider to set the camera's clock was very slick, I've had to do the sum manually before and wanted a visual way. Here are a few problems that I'd need resolved before I thought about spending any money on it.

Ignore all (0,0) coordinates. This is what GPSBabel writes into GPX files when converting something that didn't have a satellite fix at that instant

Show all the photos that are being processed and allow the user fine grain choice. Just importing an entire folder is too much.

Better underlying base map.The log I had was 10km long and the basemap was entirely one shade of green. Google's terrain map would be awesome but you can't do that if you're selling your software.

Be able to move the map around/zoomin

Don't import directly to iPhoto. Just modify the photos and leave them where they are