Apparently it is next to impossible to get into now but it never used to be. I went like 5 times between 2010-2014. I do believe it used to be that you couldn't make these reservations at 180 days out, if I am remembering correctly. I think it was actually only 30 days out unless I am remembering wrong. Anyway, it used to be easy to get into. Like the first time I went, back in 2010, I had such an outstanding meal, that the next day, I called them from my room to book another reservation during my 2 week stay and I had no problem getting in again on that short notice.
But of course, for some time now, it has been a 180 day eatery, like all the others and I do believe that change has made it very hard to get into. I looked just for fun for ressies for this month, next month, and in December, and nothing came up, even for a solo reservation.
Luckily, I have had my fill of them, because I went so much years ago when I had the chance, so I don't feel that burning desire to go back again, but it definitely was the most exceptional and out of this world dining experiences I have ever had.