I picked up a SA 8300HDC from Time Warner in Albany, NY. Unfortunately, the box is still running the horrible SARA (1.90.5.a101) software.
It looks exactly like the 8300HD, except for the cover on the back that has the CableCard. According to the SA website, the specs are the same.
One thing I noticed is when you bring up the channel guide and choose a new channel, the TV flashes the current channel for 1/2 a second, goes to the new channel, but freezes for 1/2 a second before the new show starts playing.