If your main concern is HD PQ, than by all means I would switch to E*..
Dont expect their customer service or their equipment to be any better than D*'s though..The only thing that will be better is the PQ, both SD and HD..
Customer service will still be horrible, just like D*or pretty much any cable company..
I have had both providers, and they are definately not 95% the same when it comes to PQ..
When one is downrezzing and sending out low bit rates ,and the other isnt, (other than Voom), it is impossible for them to be 95% the same..
That is a physical impossiblility, and it really shouldnt take a rocket scientist to understand this...