I've only just found this range of products, and so far I am impressed with the quality and level of detail you have gone to with them.
When trying PhotoBrush, though (I'm not sure about the other products) I noticed that an image appeared 'stronger' than in competitor's products. Trying to check image information, such as EXIF data or the ICC profile showed that PB wasn't reading the info from the TIFF files. If the ICC profile is wrongly interpreted, this probably explains the difference in appearance of the image.
Is this a known problem?
Thanks.