WOD: PreOrder Now

The app has great functionality and look. However, in our store we had some major issues. on 22 - 01 - 12 this app disabled our "Checkout" button on website and customers were really angry. We had to hire a developer to fix the issue and lost a very significant amount in sales that day. Previous to that, the app would not show the "Pre-order" button to customers even though inventory was at 0 and when customers purchased it the app never sent them pre-order emails or let them know this is a pre-order despite inventory being -1. The developer Team is very responsive, but we are just fed up with these issues.