All:
I think this is the best deal around, unless there is a catch that I don't know about yet. I have 40K flown miles on United this year (150K+ in my account), so I *know* I'm going to get 40K at the least. Hopefully the full 50.
I applied this morning via the Amex website. I got the "7-to-10 day" notice. I immediately called Amex and did two things: (1) confirmed that I *am* in the first 10,000 applicants, and (2) got my approval over the phone. I was told the reason I didn't get instant Internet approval was because I already hold another Optima rewards card (the Callaway Card). I clarified that I wanted both credit lines kept separately, and the customer service rep completed my application and approved me.
Because I *never* fly Delta, I took the Gold Card - not the Platinum. If you are just after the approximately 70,000 miles for $10,000 in spending, this appears to be a better value. The Platinum Card looks better if you are actually going to achieve Medallion status.
To all of you who applied and don't know your "first 10,000" status, give Amex a call. They should be able to tell you your status, and maybe even approve you on the phone, short-circuiting the 10 days.