I finally had a chance to gig these last night and the comment on the non-tapered B string stands. More thumpy than the rest of the set. Having said that, I got a lot of compliments on my sound last night, which was nice. I blame the strings for part of that. The E-G portion of the set do sound really nice.
Just to follow up on these, I think I would like these strings fine as a 4 string set but I don't really like the B string (non-tapered) at all. It dies rather quickly and does so with the panache of a drunk dancer. However the rest of the set is still very lively and has a nice tone to it so they will get relegated to being used on my fours. I am glad I tried them but they are not my choice for my 5ers.