My opinion is YES, by all means, 6.0 is a solid upgrade.
The bad news is that with it's somewhat schizophrenic focus on vector vs. raster worlds, the readjustment to the new methodology for applying filters and effects can be tough to get down.
If you like a challenge and can handle the fact that none of the online learning or the manual/guides is really going to help you sort it all out, GO FOR IT!
You'll like it, after you stop hating it.