Ambiance
This is the heart of the Canal Shoppes connected to the Venetian and Palazzo. Definitely make a trip here if one is staying in this area. The store itself is a pretty good size for a chocolates store. The best is to try and get a sample when they are out.
Food
Yes, it is expensive, but damn is it good. The quality of the chocolate is top notch. There are only a handful in the United States and Las Vegas has two of them. Do your due diligence to come out and try a sample at a minimum. So much variety here as well.
Service
The staff is very knowledgeable. They even put the chocolate in a dry ice pack to give some time for one to take it home and refrigerate in the hotel. Ask as many questions as needed to make the right choice.