I had the complete mod done on a 5900 that I purchased from them at the same time. Cost was appox 4K. I am using the unit with a Krell 7.1 processor along with a SimTitan 7 channel amp. This has been the best improvement that I have made to my system that I notice everytime I play my system. I would put the difference almost as much as upgrading my speakers from Dynaudio 3.3 to the new C-4's. I did not hear this much difference from upgrading my processor or my amp. My old dvd player was a Denon 4800 changer which I still am using for the 5 disc capability but if I want to get serious the 5900 is the choice. Wally at Underwoods treated me fair and right he also did what he said. Unusal sometimes today? Go for the complete mod including clock if you can afford it. Not a review or ad hype for a Dealer it is just that I am completely satisfied.
Ken
Ken