I bought both IS/A and IS/B back in 2009 or so, and I can say with CERTAINTY that I preferred IS/A. IS/B is cute and fun, but for me, the best part of IS/A was the self-effects. I have used both fairly extensively, and when I want to tone down my natural confidence and be in a more receptive state, I go with IS/B. IS/A, for women who are already sexy, confident, and powerful, can occasionally be too much for men, and with sex roles changing and more women donning traditional “Alpha Male” roles (breadwinner, high powered career person, high status or high profile), sometimes depending on your target, you don’t want to enhance this signature. This is a problem I occasionally had with IS/A. It didn’t make me bitchy or castrating or some of the effects I’ve read that A314 can have for women, but it did make me subtly unapproachable (a problem I can have without pheromones!).
Anyway, if I had to choose one, I would definitely choose IS/A. It’s a shame you guys aren’t manufacturing it right now, and I would DEFINITELY ask for a come back!
IS/B is cool, but it’s just not the same thing. Social blends for women are nice, but IS/A was so awesome for its combo of self and social effects.