Read through this whole thread, and I'd like to share my experience so far, as well as hopefully get some help with a couple issues.
I purchased the card about a month ago during Newegg's sale; I'd been waiting for a good deal like that to come around before jumping on it, so I was prety excited when it finally showed up. Installed it and ran through the entire setup prior to calling for the CC install. Scheduled the install with Cox, made sure that the tech was going to bring M-Cards (I specifically asked to make sure he brought more than 1). The phone rep was very helpful, sounded like he actually had a clue what I was talking about, which was a pleasant surprise.
The tech showed up, fiddled with my cable splitter and "nest" for a few minutes while I put the CC in the computer and booted it up. For some reason, my machine didn't want to boot into Windows at first, but as soon as I removed the CC and rebooted, it fired up just fine. Inserted the CC after Windows started and we were off to the races. Initial Ceton diagnostics showed no issues, and pairing seemed to go without a hitch. That is, until I was unable to tune any but one or two channels in MC. The tech called back, re-paired, and had them re-send an INIT (per the Ceton diagnostic). After that, everything seemed to be working. The tech noted that it might take a while before all the channels worked properly, but there were enough coming through as I flipped through that I was satisfied enough to send him on his way.
Fast forward to a couple days later, when I finally got around to doing some more in-depth testing. I've since discovered that I am unable to watch any of the "Copy-Once" channels on my HTPC. From what I have found by meticulously going through the Ceton web interface, these channels include my premiums (HBO & Starz and all their sub-channels, both HD and SD versions) and a block of SD channels (EWTN and a bunch of state/local public access channels; 13-23 here in RI). All of these channels are flagged as Copy-Once and give me the message "Copying Prohibited: The broadcaster prevents this content from being copied. You can only play this content on the same computer on which it was recorded." Mind you, this is happening on the very same computer in which the card is installed and being used. No network bridging or any of that is happening. In addition, I've checked and re-checked, and all of these channels are authorized and pass Ceton's permissions check. If I pull them up through my Xbox 360, I can watch every single one of them no problem. This leads me to believe it is likely a codec/DRM issue with my Windows install itself, as opposed to something on Cox's or the Ceton's end. If it helps, all of these channels have a signal right around -20dBmV, while all of my others are hovering in the -16dB range. All channels are showing an SNR of 30-35dB.
My other issue, which I am thinking is more of a hardware and/or codec issue is that I get minor-moderate video stuttering/jerkiness and audio sync issues on just about all of my HD channels. They also don't seem to look quite as good as they do on my STB or even on the 360 when it's being used as an extender. The SD channels look like crap anyhow, but the audio doesn't really seem to be an issue with them. I'm only confused by this because this same computer plays back Blu-Ray and HD-DVD rips (iso) and HD mkv's with no problems whatsoever. I do use the Shark codec pack, so that very well may have something to do with it.
I'm considering a fresh install just to see if any or all of these issues go away, but I'd love to hear if anyone has some other ideas before I go through all of that.
On the plus side of all of this, though, I have to admit that I'm quite pleased with the whole MC TV interface and how easy it was to get everything set up. Recording hasn't been an issue at all, and I was able to set up a batch file to automatically move my recordings from my OS drive to my RAID 5 array (all in the same machine) and that has been working flawlessly.
Hopefully this can all be sorted out with minimal troubles, and thank you all in advance for reading all this and for any help you might be able to provide!
Core 2 Duo E6600
GeForce 9500GT (via HDMI to TV)
SoundBlaster Audigy 2 ZS (via analog to Logitech Z5500)
Ceton FW 126.96.36.199
"Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying." - Arthur C. Clarke