Former Voomer and E* subscriber here. I endured 6 years with Dish, and suffered through the drama of Voom to the point where I wanted nothing to do with either one. I went back to Comcast after a 5 year hiatus, and have been pleasantly surprised. They have far fewer HD channels than Voom (about 12 altogether - including my locals), but they all seem to have interesting content that changes on a regular basis. The biggest plus is that I no longer have to have an OTA antenna, as the local HD channels come in via the cable. I may not have super sophisticated tastes, but the majority of my TV viewing occurs on the local channels - so having them come in without OTA is HUGE for me. Voom's 21 channels of home grown HD was compelling the first month, then became monotonous as the same programming was repeated ad nauseum over the past year & a half. It's refreshing to have programming on all my TVs in the house without the need for receivers in every room. On my HD set, I have Comcast's dual tuner HD receiver with built-in HD DVR, and at $10/month, it beats the crap out of VOOM and E* equipment.
As a plus, now that I have returned to Comcast, I am installing their high speed (up to 4MBS) Internet service and can finally get rid of my crawling DSL connection.
I have no regrets at this point in time, although I am holding on to my Dish equipment - just in case.