I love the service provided by the Instacart shoppers. I had a very good shopper who explained to me that they try to get exactly what is ordered. I was advised to stay near my computer and/or cell for messages regarding issues. She also told me that I can request no replacements if I only want a certain brand/flavor and/Or size of an item.
I was reading comments and want to mention to the customers that they can rate their delivery person. They are independent contractors and, for the most part, very good at what they do. As far as pricing please think about that. Instacart does not work for the store you purchase from. They train shoppers to go to the store and shop. Of course there is a surcharge on products - a mark up. The store has to be paid for all the products and Instacart needs to pay their contractors, employees and any necessary overhead. You always pay for convenience.