Summary: I returned my STR-DA5300ES after a failed repair. Ultimate electronics was nice enough to replace the unit after 60days of going back and forth. It turns out that Sony made serious changes to the amplifier block. I have owned the 5400es for two months now and the difference is immediate. The sound is much richer and harmonic distortion has diminished to almost nothing. The 5300es had more sound field settings but the 5400es has better sound control.
Summary: This receiver has all of the same limitations are the STR-DA4400ES, so check my feedback on that one too. In most situations this receiver is not worth the extra $500.00 over the STR-DA4400ES Sony expects you to pay, but you can get it a lot cheaper then list price too. I upgraded to this one for the second HDMI output since you can't convert HDMI video inputs into the zone2 component video output.