It's a feature-rich plugin to be sure, but the description on here should state clearly that it watermarks images irreversibly, so people can have that in mind before installing it. I found a response to a post on the dfactory website stating that:
"There is a way to remove watermark, but you’d need to do the following:
1. Do not apply watermark to full size images
2. Install any plugin that allows regenerating images (for e.g. AJAX Thumbnail Rebuild or Regenerate Thumbnails). Both allow you to regenerate images using an original (full size) image.
3. Then, if your original (full size) image doesn’t have a watermark applied to it you may regenerete other image sizes and so remove watermark."
Which I personally think is a bit of a major flaw. Unless I've missed something, in which case please let me know and I'll re-review it....