Phil has heard about something called a "WiFi blast range extender" which promises to solve bandwidth throttling. Is it legit? Leo says NO. The article that Phil came across was a sponsored article, disguised as legitimate content. They make plenty of promises, but not really deliver. In this case, bandwidth throttling isn't done at the router level, it's done at the ISP level. When ISPs put a bandwidth cap on you, you can work around it, you just have to either deal with the slowdown or pay for more bandwidth.
Are powerline adapters worth the money? Leo says that they are. In the early days, they weren't very good, but the latest models are better. Leo recommends TPLink.