I tried the trial version, and almost immediately determined it wouldn't be worth it for me to upgrade at this time. I'm using CS3 at the moment, and the GPU options won't work with my machine, so the only thing I could really make use of might be the content aware stuff (nifty) and the ability to adjust layer properties on multiple layers at once (also nifty) - but nifty is not enough of an incentive for me to justify the cost.