I did the comparison yesterday and for my setup (1 DVR, a 622) it would be a *lot* cheaper for me to stay with Dish, even after the $10/month promotion ends.
I also talked with a Dish CSR who was very good at answering my questions about the letter. The only question he couldn't answer was when I asked if I could get the $10/month offer even if I switched to a Dish America package. He had to ask a supervisor and when he came back he said that was approved. So, if I pick the base Dish America package I will actually pay *less* than I was for Absolute for the first year, and then just a little more after that. I will lose some channels that I love (CBS CS is the biggest one), but for that price I will stick with Dish for at least the 1 year of credits.