System: Intel Core2 Extreme CPU X9650 @ 3.00Ghz, Windows Vista x64, 8Gb RAM (set to 60%), NVIDIA Quadro FX 1700 (Driver 7.15.11.8120, dated 26/12/2008)
Firstly, as someone indicated in another thread I started about ACR, ACR 5.2 (as it is now) is reason enough to upgrade to CS4. It's simply incredible and pretty much a one-stop-shop in editing terms for the kind of work I do. (The Adjustment Brush is worth the price of the upgrade on its own. You're effectively getting PS 11 thrown in for free!) As someone said to me recently, PS is now only for the fun stuff.
However, I have a few quibbles and I should say in advance that if these are due to Preference/Settings choices on my part, then please tell me.
Overall, CS4 (PS, Bridge and ACR) is noticeably slower than CS3. All programs take longer to "settle" (for want of a better word) after opening. Bridge, in particular, takes much longer to fully load a folder of RAW files.
In PS, if I zoom in and then start using the Hand Tool to move round an image, the image continues to move for a second or so after I have let go the mouse button. It kind of skids to a halt. Also, while dragging the image around, it becomes indistinct over large areas and has to redefine itself after I let go the mouse button. A bit odd that.
While it is fantastic to now have a Heal tool as well as the Clone tool, the Clone tool doesn't always behave the same way as it does in CS3. I always have the Opacity set to 100, yet I am finding, on occasion, that I am left with a ghost impression of what I am trying to clone left behind. This never happens in CS3. Also, when I return to a cloned correction after making other changes, and click on the visible circle, the red and green circles don't always reappear.
That's pretty much it. But, I've only had it for a week or so.
D.