To convert to SWiM, you would just change out your LNB with a SWiM-LNB. You would use only one line down to a splitter that would then feed your receivers. You would also need a Power Inserter as well, but that can be hooked up near one of your receivers.
The benefits of SWiM is that you will only have one cable going to your receivers and you could use DECA if you decide to activate MRV. DECA allows ethernet traffic to go over your coax cables. The HR24 has a DECA built-in, but you would need an external DECA for your HR23 and another DECA and PI to bridge the DECA cloud to your home network/Internet (if desired).
One thing to consider is that the only SD receiver that is SWiM compatible is the D12. You can always check with DirecTV to see what they can do to upgrade you for SWiM/DECA. The normal cost is $99 plus $49 for the install, but some CSR's will help you out with that. That would include the LNB swap and the SD receiver swap, if it is not a D12. If you upgrade (or add) a receiver that would be an additional cost, but depending on your account history you might get a good deal.
Thanks for that info! So, my sd receiver is an old hughes, so If I do the swap, that would have to go, so I would be best off seeing what Directv could do, as far as that goes.
I might just use the BBC's on the HR24, when I get it, and do the swap down the road a bit, depending on how nice of a CSR I get.