Comcast sucks.
I had no problems with speed at all.
When you have 10/1 as your service, it's no surprise you noticed no difference in speed.
As for Comcast sucks, don't know about you but the two years I had Comcast were the best for speed. At the end, we "had" 100Mb down (routinely got 75-80 down, rarely saw over 90), and wish we had something like that around here. Never liked Comcast's pricing, but I'm almost paying as much for our crap DSL 30/2 that rarely is in the 20's and drops all the time.
Just never understand the Comcast sucks meme.