I've seen randyl's stats and his all-coax is perfect; my house, it's a totally different story. I'm now a mix, but probably more people have coax than Cat5 and are doing just fine with their service. There have been people who have posted who are all Cat5 and that doesn't eliminate all problems either. IMO each residence is unique. 
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*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.