Well, I will get that chance tomorrow!
The Atlanta Bass Gallery received their first one today. I just happened to be in the neighborhood and stopped in today. It had been delivered about 10 minutes before I showed up. So, I got to help take it out of the box and get it plugged in. It is definitely the best lightweight 2x12 cab I have ever played. I did get a chance to A/B against an AE410 as well.
Ken's initial description hits the nail on the head. The cabs sound very much alike..one with just more of a 10" flavor and the other a 12". As expected, the 410 is a bit tighter on the low end and a bit more grind on the top end. The 212 has a smoother bottom and top. I was playing it through an Epifani 902c so it would give me a good idea of what it would sound like with my Epi PS1000. I used a Sadowsky NYC 24-5 and P/J5. Since I was not expecting to stop by, I did not have a chance to bring my DB112s with me. So, I have not done that comparison yet. But, I already told Jim Rubio I would come by tomorrow morning with my check book and take it off his hands.

Now, I need to figure out where I am going to put yet...another bass cabinet.