This apps helps with hiding the dynamic checkout buttons from the product pages and the cart page of your Shopify storefront. Customers can use these buttons to skip the cart and quickly buy the product they're viewing.
Shopify lists some compatibility issues - the most significant side effect is that the upsell apps (like the ones in VITALS) cannot apply the discount to checkout.
Please check our fantastic help center. Chances are we've already answered your question before.
Check out our Help Center