I will be very interested to hear what others report. I just unboxed my X-03SE and, once my speakers arrive, the listening will begin. I have to say that I find your experience perplexing. I do not dispute that equipment will improve in sound as it is "run in". In my experience some equipment, loudspeakers for example, require more break in time than other components. However, the number of hours you report seems VERY extreme, as does the really poor reported performance of the unit during the early break in stage. Although I may end up eating my words once I get mine fired up, it seems to me that 5-10 hours should bring any component (other than speakers) to around 90-95% of its performance capability. The last 5-10% occurs gradually over time and is sonically pretty indistinguishable from what is achieved in the first 5-10 hours. I've found this to be the case with wire as well as electronics (again, not speakers, whose dynamic drivers do require some limbering up). I hate to suggest this but if I were in your shoes I would be investigating whether your machine may have been damaged during shipping, perhaps due to exposure. Your dealers claim doesn't really mean too much since he has little interest in disabusing you of the notion that the player needs more break in time to reach its potential. I may get bashed here but I have to say that if, after 500 hours, the player doesn't sound right there is either something wrong with it or there is a problem elsewhere in the signal chain. I'll report back after I get mine up and running and if I end up experiencing something similar I'll fess up and take my lumps.