I know some people aren't fans of the Philly and say the sourness lacks complexity, but it has been good to me the 3 times I've used it. And one of those times, I just threw it in a Saison instead of the yeast the recipe actually called for and ended up with a good no-nonsense sour beer. When bottle conditioning though it says to use bottle conditioning yeast, which I do without issuesNever used Phil's sour yeast I always use goodbelly to sour. I'll have to Google that