One of what must be 700 LV boutiques in Vegas, the Fashion Show Mall location is decent sized, carries a good range of most LV products. They've got a much bigger selection of women's accessories - as is the case with most LV boutiques - but options for men's are still plenty.
Service wise, I've had fairly good luck here over the course of a few shopping trips, with one especially great experience with Danna Cruz. On the hunt for a few small gifts for friends and family, she took the time to listen to my needs, then suggested appropriate items, wrapped them up, and even called a couple of the other other local LV boutiques when they didn't have the style I wanted.
Not all LVs deliver an excellent experience - and to be honest, very few do it consistently - but this one is at the top of my list.