My speed here at the house has gone from 3.2Mbps to around 1.1. Telecom (here in NZ)...never fails they always want to know about if you have a Master Filter. Feels like they are always using it as a crutch (never heard of anyone in Canada at home/house having (needing) one of these). My house is freaking 6 yrs old...the internet has been at 3 Mbps for 11 months and now at 1.1. I saw the ISP van on my road on Friday and my neighbor down the road is having slow connection too.For DSL anyway you can get a building filter that filters the DSL line coming in and has a terminal for a DSL run. Business DSL usually gets this unless Bell is feeling lazy that day. I find it cleaner then those dongles, but I have not heard of it being used to clean up a noisy or weak line. Usually Bell can do something on their side, bad port on the DSLAM etc.