thats correct driftertravel! From an email I got from tandent on the licensing matter they told me this:
Lightbrush 1.1 Sandbox (Mac) $99.00
Image size limited to 1000 px
Lightbrush 1.1 Regular (Mac) $395.00
No image size limits.
Lightbrush 1.1 Professional (Mac) $895.00
Batch processing and no image size limits.
I use lightbrush on pretty much everything, I agree sure you would get a better result working on raw,I use it on the 16bit tif that agisoft generates, doing it on the photos is too time consuming. To me it's a time saver when doing textures for games, sure if you have clamped areas in shadows/highlights it wont save you.
I often use it when making tilable textures as well, when you sometimes get this soft variations in lighting (upper corner have tiny light variation/blend compared to the bottom left) which makes you texture tile. Instead of trying masking and level this out in photoshop, lightbrush can help me with it.
And when you process an image you get the extracted light/shadow information in a separate image, multiplying that on top of you diffuse in photoshop you get the same result as the original texture, but now you can blend shadows back with opacity or paint back information with masking if you want too.
Yes it's not perfect but, if needed, together with regular photoshop works shadows/highlights etc I usually get what I need.
The annoying part is Tandent decided for some reason to make it mac only, they had PC when I bought it.