I haven't tried GPS much but I do get Navigate running with my correct GPS location. I've heard about the problems and expect I'll have them too if I put it to the test. The basics however seem to work. One more issue that really has to get fixed is the 3 button combo for download mode (akin to our recovery mode). That is disabled on most of the Galaxies currently shipping (even with root). This feels deliberate and is actually dangerous. They need to fix that on the next update. For now I can get to recovery from adb but if you bugger a flash you're screwed. They will have fewer service calls if people can reflash and fix their own problems.