That's interesting. I upgraded to the SA10 a few years ago (I've lost track) in fron of a modded Cary SLP90 and a Cary V12. A couple of years later (I've lost track of time on this also, which is a bad sign) I replaced the SLP 90 with a SLP05 with "the ultimate upgrade" and to my ears the sound is now a bit on the cool side and I could actually stand it to be a tad warmer.
As far as the SA10, I love it, but I have to remember that I had never heard SACDs before, and they sound great, and the digital front end I was using was 3 separate pieces from back in the '90s, so I am thinking that it was obsolete.
Is the Cary CD 306 SACD a tubed CDP?