Update on today's install as I've now had time to tweak all settings and get everything completely dialed in.. I have an HR44-500, the newer Humax model, and C41-700 (Pace) clients. Good gawd those things are tiny, as is the HR44, as we all know.. but to see them in the flesh really makes you realize how well they continue to shrink this stuff. The clients seem to be just as fast and functional as my prior H24's. I love the new RF remotes, but some of the button placement is questionable, like putting the Guide button way up in the upper left corner, where it's not an easy reach - a stupid location for such a frequently used button. The volume/channel buttons are butted right up against each other, with the prev channel & mute buttons outside of them. The other way around would have made more sense to me. I'm sure I'll get used to them. Would have really appreciated backlighting on these, but no dice. I'm having one issue - my DirecTV iPad app doesn't see any receivers to control. I uninstalled and reinstalled it, no change. Everything shows up properly in my account, everything is on my network and working fine, so I'm not sure what the problem is. I'll try restarting the DVR later and see if that cures it.
All in all - EXTREMELY pleased with the upgrade. The HR44 is lightning-fast, compact, and now serves my DVR content to the remote TVs, and that's awesome. Since the hardware cost me nothing, I'm only out the $3/month for whole home service, and the $49 truck roll. Well worth the small outlay.