We ate at the Ivy for lunch on a Monday. We were able to get a reservation for the patio with only an hour's notice, which was wonderful. The seating is VERY cramped, so if you are clausterphobic, consider another establishment. We were sitting next to someone that made me think I was on Larry David's "Curb You're Enthusiasm" as his attitude was so bad and he complained about EVERYTHING, it was actually entertaining. We only saw a couple B/C list celebrities, but the glamour of the people was fun to watch.
The food was delicious. Portions were quite big, especially for lunch and almost made the high price tag worth it for the food alone.
My only complaint was not with the restaurant itself, but with the company they hired to do their valet parking. It took more than 15 minutes for them to retrieve our car. That is never acceptable, especially when they charge three times what the garage accross the street would have charged.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.