Amai PreOrder Manager + Notify

I have just started using this app 1 month ago and I find it to be the best one currently available, just note that it will take time to get it set up proper. I added pre-orders to 1000 products and it took about 12 hours to set up. Settings can only be edited on 50 products at a time so it can take awhile but I feel it's worth it for the benefits of managing pre-order separately.

Also in case of theme compatibility issues, make sure to plan time to work with support to get it functioning properly but once they got it working, it's great. Took me 4 weeks to get the issues fixed, communicating with them daily M-F. I am excited to use this app now moving forward. So my advice is use the app, just make sure you have proper expectations of time before jumping in and be patient.

Easy to set up and use. It's the best solution if you don't want to miss any sales when you are out of stock. Responsive support. Highly recommended.

A huge thank you to Philip and the team.

Great app and great service when I encountered a few difficulties!

Many thanks

My Kit Co.™

Fantastic app.

Easy setup.

Awesome support!

It was way easier to use than I thought it would be! Pretty nice integration! Thanks team!

Great app, does exactly what I needed it to do. One little hiccup and the support jumped on it and helped me right away!! Awesome :)

Update, 12-31-16: They've made that change (below) due to my suggestion. Good job guys! Thank you for valuing your customer's feedback.
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Update, 12-26-2016: Many thanks to P.Z. from support for helping me install the id for my add to cart button in my liquid files. It was a tedious task and I only hope Pre-Order Manager can automatically make this change once you switch over to a new theme like I did (from Solo to Minimal). That's the only reason I'm not giving it a perfect 5-star rating. Trying to make this update during the holidays was rather bothersome.
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This app worked great and was easy to install with my previous Shopify store theme, Solo. Now that I've switched to the Minimal theme, it no longer works. I've contacted support and am currently awaiting their reply.

Works very well, simple and effective.

Has worked flawlessly from the get-go. Ran into a cart malfunction technical issue on a Sunday. Live chat support was there to help and the technical team implemented a fix within 24h while staying in constant communication. Great stuff!

The app is awesome that help me generate plenty of sales. Had an issue with the app but their customer service is first class. Got it solved within the day.