I, too, own P7, but I haven't opened it in a while. I have purchased every version of Poser since version 1, but I doubt I'll buy version 8.

D|S is easier and more intuitive for me to use, as I was able to configure the interface to match the way I work, and I really like the output I get with Studio.

And my favorite reason...

The Finder plugin makes content management a breeze!