WooCommerce Cart Notices:
When your customer has added an item in your cart means he has a clear intent to purchase it and has completed almost 30% of the process. Now targeting any customer at that point in time to up-sell another product or to encourage them to buy upgraded products will definitely have some impact on the decision and may benefit you.
WooCommerce Cart Notices comes with a great amount of flexibility. It gives you many options to play with and experiment to see which works best for you. If a customer has already purchased products worth $50 and if you have free shipping for cart value over $75. You can then inform your customer by showing this notice to your buyer. So this extension allows you to define notice based on the total amount. Similarly, you can decide to show a notice when a certain product is in the cart or when you have a great offer which is expiring soon.
Further, you can decide to show notice based on product category or even as per referrer. You can define any number of notices and also prioritize them. So that your customer is not ended up with many notices in front of him.