The following user review is posted on the B&H Photo website, for the TiVo Roamio Plus: Doesn't work with Charter Cable By harry from topanga Ca Comments about TiVo Roamio Plus: They don't have a turner or cable card that is compatible with Roamio, so if they are your cable co. don't buy. Q1. Would this statement universally apply to Charter Cable, regardless of location, or (as is seemingly more likely) would it depend on the local service. For example, my local Charter uses the Motorola M-CARD. Q2. Assuming there is such an incompatibility issue with Charter and Roamio Plus, would it necessarily apply to the other two models (i.e. Roamio basic and Roamio Pro)? Q3. In the event that I invest in a Roamio Plus, and then find out that it wont work with my Charter Digital cable service, which vendors have a liberal return/refund policy?