We have had a SWM HD satellite system in our coach since 2011 and it has worked well. Last quarter of 2014 we upgraded out LR DVR to a Genie and really like the fact that you can watch one thing and record four others. Five tuners and a lot more disc space. It's also nice to watch recorded stuff on the BR TV, and to schedule recordings on it as well.
You will enjoy it. My concern would be the choice of satellite dish installers. Let them know up front what you want done and if at all possible get your new receivers and have the dish installer set up the whole system. The dish installer is going to go the easiest route for wiring. If you do the receivers later and have someone else install them you may have to pay for additional wiring modifications. The receiver guy could point to the dish guy and say he didn't do it right. The dish guy could point to the receiver guy for the same reason. So, again, have the same company install the dish and receivers and confirm that everything works to your satisfaction.