I think the word my friend used to describe this place is classy. It is that but also much more. It's casual, chic, and contemporary. It's almost exactly what you expect a wine bar should be. There is something great about walking down several flights of stairs in the cellars of the M Resort to be greeted by some light music and mood-inducing ambience.
There are several wine dispensers strewn about the place and all you have to do is use your pre-paid card, put your wine glass underneath your selection and the machine will pour the right amount. It's a nice little modern touch to make you feel like you're in the future.
They also have live music on Fridays and Saturdays. It is far from the fast paced life of the strip but it's nice to leave that every now and then.