This will be a short review as I believe you shouldn't know exactly what to expect as you have dinner at é. For those that don't know, é is a 'secret' restaurant hidden inside Jaleo, at the Cosmopolitan in Las Vegas.
In short, it is as close to perfect food as I have ever tried, and miles away from anything else I tried in Las Vegas. And I tried most of the good stuff (Robuchon, Twist, Bouchon, Savoy, etc.). With a dinner comprised of several appetizers, main courses and deserts, I couldn't say what I liked best. Every single course was beyond good. And the setting, the chefs and people that work there make this a really unique experience everyone should have. You can really tell the chefs feel fortunate to be cooking the food they are cooking.
If you are looking for a truly great experience and the best food in Las Vegas, then é is your best bet.
Oh, and they told me the reservation system is working fine now.
é by José Andrés
3708 Las Vegas Blvd S, Las Vegas, NV 89109