A second box would have the same channels as the first box and be able to watch different channels at the same time.
In addition, if the two boxes are TiVos and/or V6s and are both connected to your home network, you can watch recordings from one box on the TV connected to the other box. This is called Multi-Room Streaming, MRS.
Do you still supply the standard HD non TIVo box like the one I have installed here?
As Ben states, the 500Gb TiVO is the standard box now. The boxes using the older firmware platform are on a phased withdrawal as customers change their contracts. You may have the option to move your existing VHD upstairs & put the TiVO in downstairs. It depends what VM's accounting systems will allow being set up.
Cable customer since 1993. Services: FH TV, Sky Sports & Movies (2xV6), Talk Anytime Phone, VIVID 350, Virgin PAYG Mobile