We didn't bother to ugrade from PSE ver. 2 to ver. 3 because 3 didn't offer that much more than 2 and the upgrade didn't seem to be worth the money. However, we were just given a coupon for an upgrade to ver. 4 at less than 1/2 price. Is 4 worth it? Is it that much better than 2? I know it's much more difficult to add Curves to 4, but the new Hidden Power book for 4 claims to be able to do it. Thanks!!! Steve . . .