I have had Fios for a couple of years now. It has only slowed down a couple of times. I used the online assistant thing to let the tech see my system. He would run a speed test, read the results, and make some kind of tweak in the router. More recently Verizon has been offering faster speeds but people are saying you won't be able to tell the difference unless you have multiple computers that are lagging the system. The average user with typical equipment cannot take advantage of the speed. I did not sign up for it since my systems work fine now. I transfer video for work and also watch Netflix a lot. Sometimes it takes a few minutes for Netflix to buffer HD but it is always good quality.