I have spent more time w/ the HM-801 and I have to say I am very impressed with its sound. The delivery is IMO very accurate, clear, involving, musical, etc. etc. etc.
However, it is a device that demands knowledge on the part of the user in order to use it and enjoy it. For an old fart who has only used iTunes it is very cumbersome to use the HM-801 due to file conversion from ALAC to FLAC plus the need to buy 32GB SDHC Kingston cards. This may be no problems to many or just minor inconveniences, but to me it will be a deal breaker which is sad because it sounds so darn good. I may change my mind but do not hold your breath.
If anyone has any suggestions/questions or improvements please let me know.