I have no issue with running in new devices. Running in speakers or even amps for 200-300 hours I understand. But running in a dac for 100 hours should already get me at 80% of its performance. Furthermore, I even think some brands say running in takes such crazy amount of time that you need to pass the 14 day trial period for online purchases so you cannot return them for a full refund. So, no I will not run in dac for 500-1000 hours that is just a bit over the top.These dacs usually need at least 500 hours for the full burn-in to reveal their full sonic signature. Some dacs even need around 1000 of music signal flowing thru them.