Notify! Back in Stock|PreOrder

Works fantastic. I test it every now and then by using the notify button myself on a not before used email address and as soon as stock comes back online I get the email every time straight away. I also like the statistics to see who opened the email, who clicked the link and who actually made a purchase. And I can see which product is popular, so I know where to put my priorities with ordering in new stock.
The fee is definitely worth the extra revenue! Would recommend!