Originally Posted by northgreenwich

Endo is impossible, on the basis that slots are extremely in demand (thus is the nature of Omakase) and slots open up every two months.

I had to wake up at 9 AM on the 1st of December and as I was looking at the booking options available, slots started disappearing real-time (no doubt being booked up by concierge services).

Therefore less to do with the AMEX Concierge and more to do with the fact that slots at Endo are impossible to secure within short notice.