My Darbee reset a few times months ago when i was changing settings a lot.Ive left it alone for a long while at one setting and it has not reset itself.
Just my opinion but Ive used it with blu-ray and sd dvds and I feel you see more of a difference using it with sd dvds since Blu rays are almost perfect to begin with.
I have the dvd of the Chicago/earth wind And fire concert and its excellent.One that I can recommend is Procol Harum Live At Union Chapel.Pq/Aq is excellent,in fact the Aq is one of best i have ever heard,especially the bass and drums.