I'm very new to radio and just recently picked up a pair of H8 Gen 3s and a pair of H8 Gen 2s (bought their "mystery box" H8 offer). I've done a little bit of programming with ODmaster via bluetooth. Data cable came yesterday, so now I can mess with CHIRP and firmware.
I'm tempted to experiment with Nicsure firmware, or any other custom firmware that might be out for these. Its been a fun learning experience so far.