The AE212 is a great reference cab, IMO. VERY even. VERY portable. a Great tool.
That said, I am getting increasingly cautious about making blanket statements about any of this gear thing taking one element at a time. What I am finding is that I get dramatically different results mixing basses, heads and cabs.
For example, several video recordings my band took, in which I was using a Sadowsky RV4 into a GB ShuttleMAX 12 driving two Schroeder 115+L recently, caused me to do a certain amount of a/b testing this past weekend. The Schroeder stack is one I use when I want portability and some volume. Thing was, the bass in the recording was pushing way more lows than I would have expected for those cabs.
Anyhow, bouncing around with different basses into the Schroeders, the AE212, and an NV610; what I tentatively found was a little bit surprising. My Fender Jazz (a '62) and the Sadowsky produce noticeably more bass and lower mid push through both the Schroeder stack and the NV610 than through the AE212. Honestly, the AE212 in direct comparison sort of sounds like the bottom fell out all of a sudden. Nice very even sound, but definitely less of whatever low mids are pushing through the band mix.
OTOH, my Bartolini equipped Tobias Signature (a Hollywood bass) and Zon Sonus, which produce way more low end content coming out of their circuits (relatively speaking), sound perfectly balanced into the AE212 with plenty of low mid push. Just killer rigs. Same instruments into the other two cab setups tend to get congested and lose their definition.
So, IMO, their is a yin yang between the various elements in the package that has to be kept in mind. Last comment is that the result with the Schroeders really surprised me, because I did not consider those cabs as having much low end content. FWIW here are two links to the same cover tune. The first has the J (with Sadowsky outboard) going into the AE212. The second is the Sadowsky RV4 into the Schroeders. Same somewhat cheap recording limitations; so not saying anything about audio quality. But, if you listen with phones the difference becomes immediately clear nonetheless. (Warning: you have to actually listen to the bass and stop staring at the two front singers

)
AE212
Different Breed Paris - YouTube
Schroeder 2 x 115+L
Different Breed - Fri Nov 11 2011 @Dos Gringos Tempe - "Paris (Ooh La La)" - YouTube
Anyhow, point of all this is that TB has such a wide range of styles and instruments, that it is pretty important when making comments about performance of various pieces of gear to put the experience in context, IMO. OTOH, maybe, I should just go back to one bass, head, and cab, and then not get all off into these kinds of complications. I dunno.