I honestly haven't been following all this very well...(No sense drooling over speakers for which I don't have the budget nor space, and all that).
But is the Bryston T and the new M100 the same design? Looks like the same driver complement at a quick glance.
The Brystons have different woofers. They have a re-worked 8" woofer, and also an improved 5 1/4" woofer as well i think?
the work on the Model T's 8" drivers is what spawned the improved 6 1/2 driver for the LFR's is my understanding.
Ian has noted that there are differences in the cabinet. I believe that the model T's front baffle is 1 1/2" thick MDF, where the LFR's and i would assume the M100's is 3/4" MDF. the cabniet for the Model T's also have different geometry than the M100's. The M100's use the standard Axiom design. Where the Model T has more compound curves there are subtle differences that can be noticed upon close inspection of photos available online.