Grateful for the freebies you've so generously shared. My experience as a user of P4, Daz Studio and P6 (I never owned P5) is that if something is useable in P4, a lot of DS-only users would probably be able to use those. If something is made for P6 strictly, one could end up with a lot more fancy effects, as well as more computationally-intensive demands on the end-user's machines. Users with older computer processors will most likely have a tougher time with dynamic hair and cloth, if you offer these. Materials Room can produce gorgeous results, but these won't be available for Poser 4 users, if created in Advance Mode. One can't make those BUM files for Poser 4 users inside of Poser 6. One has to make decisions on saving in compressed formats and using external morphs, which Poser 4 users cannot handle, but Poser 6 users can. But over all, I think the decision to upgrade to Poser 6 is not just based on what you want to make for other people, smilez. IMHO, from a creative aspect, perhaps you will enjoy using Poser 6 's features. I find myself kicking P6 a bit now and then, even insulting it, but it's been an upgrade I have not regretted so far.

Eternal Hobbyist