There is most definitely a noticeable difference in how this operates compared to CM9. App drawer side-swiping and screen rotation are the two easiest tests for me to try, and there isn't any other word to describe it except "buttery." Very pleased. I put it through its paces last night (ran down about 50% battery) and no random reboots or SODs so far.
My only question is why our device was passed over for an OEM upgrade to JB. If a ported version runs so well on a garbage kernel, I can only imagine how well an official version would work on our hardware. Ah well, such is life, and this is the reason we have crazy awesome devs like DZK. Hope your upgrade doesn't come any time soon man.