As long as the subscription is always active, if you were grandfathered into HDFFL, and go to say, Welcome Pack, if you decide later to go back to the AT200, then You would still be grandfathered with the tag line item on their system. This grandfathered programming, works different then the others, such as superstations. Reason being, if you remember the disclosures for HDFFL, it stated as long as the account stays current you will maintain HDFFL. If your account gets disco'd, for something like non payment or anything else, it's possible to lose it then, I'm unfamiliar with that territory.