As great as simple, this plugin is just what i needed! You can set up date and time of when you want the product to be available for sale, until that instead of "add to cart" button there will be a counter. Once the time is expired, add to cart button will appear again. The same happens on main shop page and on single product page. The great thing is that you can add a custom text for each product that will appear below the counter.
Wanted to follow up with an updated rating. The developer did contact me and offered me a full refund. He also took the time to test the plugin on the theme I was using to see if he could resolve my issues.
This plugin works great for my needs. Getting ready to launch a new online store and needed all my products to show countdown with coming soon. Had an issue with the "add to cart" button still showing and the countdown timer was too large for my theme. Contacted the author and it was fixed for me! While I expected to be given some code to go change, this fix was done for me and applied to all products so it works for my theme. Thanks so much!!