I've had my AMEX Gold for just under a year, and was instantly approved for 10K at Costco, even with a 1 year old CO on record. Also, I only really used the AMEX for CreditSecure, so there wasn't too much activity showing.
So who got their 2nd AMEX after having the first one for only 6 Mos?
I apped and was instant approved 3/28/11 for the Blue Cash, apped and instant approved 7/16/11 for the PR Gold. Both backdated to 91.