EDIT - After an original bad experience with the app, Ankit messaged me and offered to resolve the issue for my shop directly. He got it working within a couple of hours, and seems to be good for now. Will update here if necessary. The interface is very easy to work with, appreciate the option for "common" images, so don't have to select for every variant. so 5 stars on that. Very quick and friendly support. If it continues to work as described, I will be very happy, and will upgrade to 5 stars review. The reason for 4 stars is for the original bad experience of the app malfunctioning and deleting my original variant images on first test product. I suggest installing with a TEST product, confirming that it works (or getting support to get it to function properly) before rolling out to all products in case of an error. 5 stars for quick and friendly support.
-----ORIGINAL REVIEW BELOW, was resolved by support----
BEWARE this app, it removes your set variant images from products, so if you uninstall the app, none of your products that you have set up will have any variant images set, so you will have to reset them all manually for every product that you previously set up using the Clever Variant Images app. Easier to use interface than Free Variant Images app, but not worth even "testing" this app as you'll lose any preset variant images you had... The only reason for the 2 stars is that the interface is easy to work with, but just everyone beware, you will be locked in to the app, as changing your mind will DELETE any preset variants on your store.