I have the Amex Blue Cash card as well. I compared it to the cash back from the Costco Amex but Blue Cash is better (at least for my spending patterns). You do have to take into account that the 5% (groceries, gas–but not Costco gas, drugstores) and 1.25% (everything else) rebates don’t start until you’ve already spent $6000. We don’t travel enough to make the futzing with rewards points, hotels stays etc. worth it. Just show me the cash back, please! 🙂