agree with everything Nick said. Definitely not a night and day improvement, but noticeable to me. Imagning and bass response is what I hear the most improvement in.
On video though, it is noticeable. I run my dvd, tv and sat receiver, as well as all the coax connections through it, and honestly, the DVD playback is marginally better...more contrast in colors...more vivid, but the HD channells on directv blow me away. What looked good before looks significantly better now...I also think, contrary to my earlier report, that is has improved my SD channels, though marginally. A couple of them (the analog ones for the most part) do not appear as grainy as they did to me before.
But bottom line, the surge protection and outlets alone make this unit a good buy. Really helped clean up alot of my cable clutter