I have had this service for about a year. Sometimes it is great! Other times it is not! My number 1 complaint is the app and the shipping preference. Sometimes there is a glitch. When you change your shipping preferences the app might not respond exactly to your changes. What happens is this! You will get an email that is completely opposite of what you requested. Then you can't make a change, amend an error, cancel the shipping, or get through to customer service via email. Now you will be stuck with a charge that is inflated in which you tried to avoid. Now you left with the challenge to redeem your money back for something you didn't exactly ask for. This has happened on a few occasions. I am angry because my shipping cost have been over $100 and in some instances it is easier, cheaper and safer to buy directly from Amazon.