One interesting thing to emerge so far for me Willie just mentioned in his thread: Bryan has managed to get uniform growth from his, something that seems ideal but does not seem to have been realized elsewhere. I'm really curious about that. There definitely was a difference in sizes among the fish we all got, yet he was able to close that gap. If I remember he may have attributed that to heavy BBS feeding early, combined with water changes, and continuous lighting. Anyway, some more conversation about that may ensue in their threads, but there may be something to learn here.
In my case I'll note that my BBS hatchery doesn't produce really large quantities, and unless I added a second one it's hard to have a consistent supply all the time, so that has always been one food source among several for me. Of the things I'm offering them now I'd say the FDBW are #1 on their list. Would love to see if the smaller fish can do some catching up as the growth continues, but not sure how to make that happen, if it is still possible.