i believe the $99 LT service is for older models which you currently pay monthly on...that when you pay the full 399/499 for LT on a Roamio they can give you LT on an older device for 99.
Roamio Pro, wired ethernet
Mini using MOCA (from the Pro)
on Cablevision Raritan Valley system (Central NJ)
w/ Cisco PKM803 CableCARD on firmware 22.214.171.1241
*** 2013 newbie to Tivo ***