I have only tried the regular single barrel. When I looked at mashbills and yeasts, it is the one that I thought matched my tastes. And it did! Of course, I have nothing else in the Four Roses line to compare it to, except for the SmB. I think that 100 proof works just fine for me. I guess one question that I have is how much different would I expect a limited edition or private barrel of the OBSV to be? I just can't imagine it getting much better. However, I can see how, some of the other mashbills and yeasts would be of interest and the only way to know if I like them equal or better to OBSV would be to try them.