I would be interested to know if anyone noticed the difference in normal everyday usage. I went from 60 to 100 recently (106 actually) and there is NO difference in practical terms . Perhaps the page loads in 1 millisecond rather than 2, but as far as I can see it behaves identically.
It might be different if I downloaded huge video files but I tend not to do that very often. Even then it is the server that seems to define the time rather than the bandwidth.