I downloaded the demo of ArtRage 6 and played around with it a bit. I honestly can not see that much of a difference in features or toolsets with ver 5.
I was disappointed by the removal of the chalk brush. It appears now there is only the wax tool.
I have not used it long enough to comment on performance.
I think I'll hold off upgrading until version 7. Perhaps it will offer more.
Love version 5. No need for me to upgrade unless someone can prove me wrong.