Hope I didn't offend. Compared to, let's say, smokers which provide a serious beneficial service to beekeepers, Slatted Bottom Boards are hard to find for the most part. If they really boosted honey production or made a difference in the survival of the hive, everybody would be using them. I think, if memory serves me right, it was C.C. Miller who really did extoll their virtues and he was no slouch when it came to beekeeping. My point was that if they really did improve things so much everybody would be using them. They've been around for a long time and have lingered on the fringe of the beekeeping public for the most part. Michael Bush's post above just about sums it up. When he ran a few hives he liked them. When he seriously expanded his operation they fell by the wayside, their cost not justifying their use. If you want to try them out please do and run a few hives side by side, comparing performance of the slatted bottom board to hive without them. I'd love to see a report on how performance differed. You might convince me yet.
Another thing about them is their acronym, SBB, conflicts with the Screened Bottom Board and creates the possibility of confusion. Interestingly enough, screened bottom boards, which have become very popular, have recently received some very poor reports, most prominently from Randy Oliver. I know many beekeepers that bought into them, me included. It will be interesting to see if they stay popular or if we'll see many of them offered for trade here soon.