OK thanks for heads up Dave. I didn't check the background...
BFM cabs are largely a DIY thing unless you pay a builder to make them for you, at which point they may not be economically attractive.
Alembic owners tend to be the sort of people who are less likely to DIY bass gear - a generalisation though this may be,a generalisation it remains. I don't see it applying to all. I have tinkered with my basses, cabs and rack gear, Alembic or otherwise since I started playing so there must be others who do so too.
I generally use my own design 4 way cabs(3 way top, and sub - 1X12,1X6,peerless tweeter + 2X12 sub) , crossovered and Driveracked and RTA EQ compensated, so I like the full frequency balanced sound.
The BFMs are primarily full range PA systems and they are not magically better than other full range EQ'ed Systems except that they are horn loaded, and therefore more efficient per watt, and lighter because there are less drivers and the box design's are invariably braced 12mm ply instead. So anyone who has done a large concert and played through a well balanced full range horn loaded PA rig is largely going to have the same sort of sound. Whether you want that in your backline is a different consideration.
My interest in BFM is primarily weight and efficiency. Where the designs do not compromise though is size. The BFMs are not small because efficiency is paramount in his designs.
Hoffman's law states that out of efficiency, size, and low extension - you can only ever have two out of these 3 and so BFMs are large and low & >100dB... and ACME cabs are low and small & 90dB.
Also horn loading has noticeably less driver distortion than any direct radiator, and this is a good and bad thing depending on what you want to achieve. Low distortion is good if you want it, but if you want growl - a large part of that is essentially direct radiator distortion.
