I posted earlier in this or one of the previous threads. My comparison was the first or second-generation 46 and most recently the 45/110 combo. My general take is that those MAS cabs have more low-mid push and thickness whereas the Baers are more about mid and upper-mid articulation with some edge (reminiscent of the AE210s, but without the occasional harshness those cabs can get). When I hear/see recordings of the guys who dig Mike's cabs, I get why they dig them, and why they aren't quite my thing as I tend to prefer a bit less low-mid content, and I really like to hear the upper-mids speak. Truth be told with the right head you can eq either cab in either direction but in a perfect world I want my head running flat and getting "my sound" with the eq being used to deal with a room or a bass change.
I haven't tried the Flex, and per Mike the Baer sound can be dialed in, at least fairly close. In part, my feedback helped push Mike a bit in the cab design to give some different colors. I will likely have one of the modular Flexes to test at some point. While I dig the sound of my Baers, no cab is perfect. I'd love to have something with a bit less physical depth (loved the AE210s and the 46 in that regard), and no tolex, and with that mid presence that I like and still enough low end push to get people dancing.
I appreciate that. I wasn't so much interested in the tonal differences as the idea that these cabs handle rooms better than "conventional" cabs, for lack of a better word.

So when a regular gigging bassist in LA says these cabs don't quite get it (so far), for him verses his Baer or whatever cab, or after he tries the Flex cabs he will repost, I accept with total informed appreciation. The MASBigE are not everyones cab. Thank goodness. I don't want to live in a one fits all society. For what it is worth he is an accomplished jazz/pop player who can do justice to jazz tunes that I could not do justice too if I tried.