My girlfriend and I have been using Instacart for quite some time now. Overall, the experience has been fantastic, mainly because of a bunch of free-delivery offers. While I really, really hope they stick around (especially with the addition of Whole Foods), almost every order has had some small problem. Usually these are substitutions of the items I really wanted, but occasionally we've gotten items that we didn't order. We weren't charged for the extras, and their customer service is <i>absolutely</i> top-notch. If anyone from Instacart is reading: please be careful to maintain your quality standards as you scale! I'm OK with the price premium and even delivery fees, as long as it's backed up with the current level of service. Great job, and good luck!