So far, so good on the new Charter SA8300HD DVR box.
I have always had some issues with the analog channel quality from Charter, and using this new box is no different, but the digital channels look fine, and, most important, the HD channels also look fine.
I do think the OTA HD channels I receive (KCBS, KCAL, KTTV, KOCE) look better than Charter's offerings, and KABC's football HDcasts have been sort up "jumpy," but for the same price as I was paying for their SD DVR box ($9.99), it is worth the upgrade. I finally feel as if I'm getting the full functionality from of my HD set. And, actually, the DVR functionality in this box is MUCH improved over the earlier SA DVR model we had - no playback hiccups or delays to set recording times, quieter whirrrr sound from the hard drive. Also an improved IR remote than before (although I cannot use all the AUX buttons functions for my Sony stereo as I could before).
Would I pay another $7 for ESPN and HDNet? No, it would take at least 7 more channels that I couldn't already get in SD before I would consider paying another 7 dollars.
I would recommend checking out the HD box to try out the HD DVR service. Hopefully they'll add PBS-HD and the other local channels soon.