I have had the Explorer 8000 stb (PVR) for 2 months and all is well. Today I called Time-Warner to ask about the future PVR with HD. That's another 8 months away. OK, I said, can I rent the HD stb also and connect both to an AB switch? Then I can record shows like I've been doing and I'll have access to HD programming. Sure, she said, theoretically it will work. Tomorrow they'll deliver the Explorer 3100. So, is the AB the best connection method, or should I use both simutaneously to different hookups on the TV (Tosh 50H82) and alternate with the TV remote, or is there another connection method I should try??? Anyone done this before?