I have 6 and 7. Never use 7...cuz they changed the whole interface and I like the old one better. I keep 5 on my computer just for the "line tool" which is easy to use. I really have not found much in 7 that would make it worthwhile. It may depend a lot on what you use it for. If you do a lot of image "design" its probably good. I use it for modifying images to look real, photo enhancement and good ol fashion painting. So 6 works great.