Thanks! We just opened the Amex connected with Costco as well. Some of those rewards aren't bad; 2% for travel and gas is 3% everything else is just 1% but something extra and no fee as long as the costco card is up to date (they make sure they charge it directly!)
I have the Amex too and I love it. Besides all my Costco purchases, I use it for gas, restaurants and any traveling expenses. I charged the Tauck and Linblad trips on it this year too, so I'm going to have a big rebate.