Notify! Back in Stock|PreOrder

I actually downloaded 2 restock alert apps. Notify Me! And a competitor. The competitor's was 3x more expensive per month. Both have the same interface. I was having trouble with my button showing up on the product pages. I messaged both apps, but Notify Me! got back to me within a few hours and not only fixed the issue provided me with extra help and other resources/information that I needed. This is the kind of service that all Shopify apps would benefit having. I will definitely be recommending Notify Me! to my friends and colleagues.