Surge Protection and conditioning

I own a monster HTS-3500 MK II and I owned the HTS 5100 for about a week. The only difference that I could find between the 2 was the 5100's cool digital display coupled with its not so cool $150.00 to $200.00 higher price tag.

I have a Samsung Widescreen HD 30" Monitor and both units provided a definite video improvement, but audio was very slight to non-existant.