I took my wife here for her 30th birthday. The views as everyone else has stated are WELL worth the visit. We arrived in mid January for a 6pm reservation and the sun had just set, leaving a breathtaking view of the surrounding mountains. The colors in the sky were captured perfectly in the floor to ceiling glass that fronts the entire restaurant.
Service was great but the food was merely good...not great. I had the lamb and my wife had the fillet. I would say hers was better than mine but neither were out of this world. Especially considering the price.
That said, it is a must visit in the Valley for the views and ambiance alone.