Great is you hit it at the right time and with the right attitude. Drinks are very good, but very expensive. Some food options, but very few. Crowded, noisy. Service is slow and maybe just a tad snobbish.
But, you don't go there for the food and drinks. The highlight here is the view over Paris toward the Eiffel Tower and Vuitton museum.
Go as soon as they open. There are only a few tables with good window views and they will up fast.