Most Vegas establishments have great service. Spago has superlative service without compromising on the quality of food--no mean feat given the curious mix of patrons one might see in any Vegas joint--an odd subset of world population indulging in undocumented excesses with impunity, even if only briefly.
I was seated within minutes of getting to Spago, and the friendly server was as tactful in making menu recommendations as he was in engaging in small talk with me. The chopped vegetable salad was excellent, especially if you like your salad chopped finely. I also tried the Valrhona chocolate dessert--well executed and presented. Their teas are served in glass kettles--a welcome improvement over steel ones with too-hot-to-the-touch handles.
If I find myself in Vegas again, I will be sure to return. But in the meantime, I would have to settle for the sub-par salad options in New York.