Seems like it'd be prone to breakage if/when Netflix changes, well, anything on their end. And you'd still have to be tunneling the traffic through their servers, otherwise I don't see how it would work.
Sounds like when it works, it's great, but I question if it would work for everyone (depending on their datacenter presence) or how reliably it would work.
If I were the OP, I would not make an internet speed upgrade decision based on a week of trying this service, but that's just me. --
"I drank what?" -Socrates