Works great for me

I was hesitant to use this plugin due to the negative reviews. So I tested the Free version and it worked fine. While the Free version lacks some features that I specifically needed, it does a great job or doing what it says on here.

I have tested adding the watermark manually, automatically and regenerating the watermarked images. It also has a restore function to remove all watermarks.

You can manage watermarks for individual images as well.

I have tested this on my own themes and WP default themes. I have tested it with few plugins and with many plugins installed. So far I have had no conflict or config issues.

I went and purchased the Pro version (really cheap with ongoing updates) after being happy with the Free version as I wanted to manage the display of my logo in a better location and size with for each WooCommerce image size.

So my review here is for the Free version with an added bonus for the Pro version

So ignore the negative reviews and give it a try.