Networking is done through coax.
They have Double Play which is different than DLB. You press the down arrow to activate and then can switch between two tuners. It's not always buffering - you have to activate it. Once activated it will continue to buffer until 2 hours after you've stopped using it, then it won't buffer any longer. On the plus side, it will buffer for 90 minutes, versus the TiVo's 30 minute buffer.