I recently received 2 HR24s from amazon.com. I've got my new service all set up with D*, but unfortunately they can't schedule me for an install until Sept 27th. I'm pretty anxious to try out the new boxes, but I don't know if they are compatible with my current setup. Currently I have two old (2003) SD DTivos. I have one of the older 3 LNB elliptical dishes (don't know if there's a specific name for this type of dish). Can I swap out the old DTivos for the HR24s without any issues? Obviously, I'm not expecting the HD channels. I'm thinking that MRV may not work with the older multi-switch? Also can I connect both tuners - the wife is a Dual Live Buffer addict? I just want to try out the new boxes and start playing around with the D* user interface, maybe start setting up a few recordings. Oh, the HR24s have already been activated, so that's not an issue. They said they needed to activate them to place my upgrade order since I had purchased the units on my own. Thanks in advance!