The coupons! You take the time to clip them, sort them and most the time get to the store and either forget to use them or most of the products you wanted are not on the shelves. I used to drive an hour to do my shopping and left my coupons at home. No savings for that trip.
I love the reminders. You start to run low on your household essentials and checking your email you will find a nice friendly reminder and the savings you not have on the products you use constantly.