Just to clarify, people are talking about 2 different issues. Z-Brush seems to be quite good for making MTs for Poser (though I think the latest version had to be updated to address a small bug in that regard). Check out Zrincx and RnRWoman in the Galleries for examples. The high poly-count issue comes in when you model something from scratch in Z-Brush and want to import it into Poser. In that case, there may be issues based on the capacity of a user's computer, just as V3 puts a bigger strain on the computer than V2, which was bigger than the original Victoria, who is bigger than Posette, etc.