The only thing I use from Monster Power is their Reference Power Centers. I wouldn't recommend using Monster for cables, but they do make good power conditioners. They do work really well, and have protected my equipment through a serious power surge. They also cleaned up a lot of video and audio interference as well. I live near an independent radio station, and they cause all sorts of interference.
My home theater room has a Monster Reference Power Conditioner HTS 3500 Mk II, and I use the HTS 2500 Mk II for my 2 channel SACD listening room. Both have noticeably reduced the noise floor and cleared up video noise as well. The 3500 MkII, or it's replacement the 3600 MkII, work really well. The 3500 received the Editor's Choice Award from The Absolute Sound. Here's a link to their review page, where you can download the full review.
http://www.avguide.com/products/product-3051/