The most flexible image resizing application I've tried. I'd give it 5 stars if it weren't for a couple of drawbacks:
1) if the source folder is fiddled with a little during processing (e.g., if you simple view one of the images in the folder being processed, and that image is resized while still open), the application will unexpectedly quit.
2) if you drag another folder onto the application, mistakenly thinking it had finished with the prior job, that prior job is cancelled without any warning.
3) resource-intensive; clicking "cancel" can sometimes take 10-15 seconds or longer.
Still, the worth of the product outweighs the negatives, and I use it regularly.