I've been using dish network and just switched to their DVR service. Unfortunately they sent the lowest end unit they have which is the 510. It isn't a dual tuner unit nor does it do a Season Pass type thing -- really I can't believe they even still offer it. I'm refusing the package to have it sent back and will pay the upgrade charge to get the next one up which is the 625, I think.

The 625 is dual tuner and has what they call Name Based Recording:

Pick any show and the DVR will find all new episodes and record them regardless of any changes in program length or broadcast schedule!

625 Product Info PDF