bought a Monster Power HTS3500 MKII simply to protect my gear from surges and power irregularities because I am in an old rental home and the wiring is not quite up to code. I bought this particular unit only because I found it for $150 with a rebate... making it $100 shipped.

I noticed an immediate improvement in video clarity. There is some discussion (between my wife and I) whether it also improved the sound quality and clarity--if anything it was quite minor.

The unit is probably overkill for my purposes, but between the improved picture and the protection it is providing, I am happy with the purchase. I certainly wouldn't recommend buying one of these seeking a performance boost. Only for surge protection. Any inherent benefits should be a bonus.

--TDA