The demo versions apply a watermark to the image. If you purchase them together, you automatically get a $20 discount. They work in Photoshop 6. You can use them for batch processing (Read about Cloak Mode in the manual).
I posted that message before I actually installed and used the demo versions. After trying out FocalBlade and ColorWasher, I'll definitely order them but I'm not yet sure if I'll order LightMachine as I won't save anything by buying it now.
If you order all three, you get a $20 discount. If you order only ColorWasher and FocalBlade, you will get a $10 discount. If you order LightMachine later, you will get no additional discount.