So, I read here and elsewhere I can get this with an XL4 in SF Bay Area (Oakland). Order one, go to get Comcast account, rep tells me no go; can't get On Demand without their set top box. Go back to Tivo support site; says to get it I have to have On Demand subscription. OK, so now back to Comcast: can I get this or not with just a Premiere? Or should I just get the regular ol' Comcast service up and running and then start pestering them to ADD the on demand service?