Have you tried a D12?
While much of DIRECTV's HD equipment is somewhat lethargic, the D12 is not similarly afflicted.
The Internet reviews of the DRD 48x series tell a decidedly different story about working well and being well liked.
Indeed? That DRD 480 RE is a superb RV receiver; and when not in the RV is our bedroom receiver. Portable, simple, fast to boot, behaves much more like a traditional cable box, which was probably the original intent. Alas, I hear they are not compatible with the genie/client SWM dish, so I may soon say goodbye to an old faithful friend.