Thanks for the responses! There is a lot I don't know. I was assuming that my downloads would have more bandwidth with the 3.0 service even though I will max out at the 1.5 speed (which I am paying for and getting). For example when trying to watch a streamed movie on TV last night with Roku, and often times on the computer from youtube, my picture will stop until it catches up with the download. I read somewhere that with Docsys 3.0 and the "channel bonding" I should have an effectively faster data transfer because I can get more data through at the same speed.
Your answers seem to say that it's only speed that makes the difference. Why should it be an advantage only at higher data speeds?
Interestingly enough the movie that kept hanging up was from a little-used free movie channel but when I went to Amazon I watched a movie all the way through without any problem at all. Could that be because Amazon does a better job of streaming somehow?
Thanks again for the help.