This unit (panasonic DP-UB9000) has the identical picture quality of the Panasonic DP-UB820 model but the dp ub9000 unit is built much better. I have already gone through 2 of the DP UB 820 models with their tray jamming and the unit then is unable to use. The larger unit is built stronger and seems to have a better tray system for the blu ray discs. I have not tested the unit for Sound