Anyone tried it? Does it work?
Why bother.
Broadband is a consumer quality service that is contended and has practically no guarantees in terms of speed you are likely to get (or anything else for that matter).
I just don't understand people who spend money on expensive filters, gold plated cables or whatever.....
For most people it's just a placebo effect, with only one or two exceptions (e.g. people in desperate situations who would normally be considered as being too far from their exchange).