Initially when I downloaded this app it did not work with my theme. Contacted Customer support where Hana replied immediately, Hana and dev Gideon worked with me to resolve it but there were too many bugs. The only reason I'm giving 2 stars instead of 1 is because of the friendly customer service, but the app I cannot recommend at all.
I like the fact that you can easily add size charts and you don't need to do any sort of changes in the code like is required if you have different types of products.
BUT, it has drastically increased the loading time of my site, specially product pages and collection pages. I wish there was a workaround for that.