I recently had SL to change out my/their DVR/cable box for their TiVo. When comparing it with TiVo's three Premiere models (Premiere, Premiere XL and Premiere XL4), it does not have the same features as any of these three models. My SL TiVo will copy 4 programs at the same time (same as the XL4), but as told to me by SL, will only record 45 hours of HD programing. The front and rear panel (one cable connector, no ant. connections) looks the same as the XL4. Is this a special Series 4 made just for Suddenlink?