The AP80 uses the same chip as the pro, only the pro uses 2 of them and has balanced output. So more output power from the pro if you use balanced. But less battery life because it's the same battery between the two and the pro has dual DAC chips. Makes sense. As far as crashing, I've never had the AP80Pro crash. I don't use any of the MSEB or eq functions. Just plug and play off SD card. I don't even use the internal DAC any more. I only use it as a transport now. If you want to keep it all Hidizs and can handle a little more bulk, the companion Hidizs DAC/amplifier (DH80 or DH80S) makes for a much better sounding solution ... IMHO.