Issues with app at first, but developer reached out within minutes. Not only that but updated and fixed the app to work properly. We're no longer using it, but worth a shot simply because it's clear they care about their product!
I downloaded this app to help me with my sale took a bit of time to understand but support from John has been great. There are a few additions that would help. I am looking forward to seeing how my sale works, it is great using this app instead of sitting up all night altering Shopify prices.