I have been coming here annually for a convention held in January for the last 5-6 years. Our convention is medium-sized - several hundred exhibitors and several thousand visitors (or so we're told) - so we don't use the entire space, just several of the halls. There are plenty of bathroom facilities and they are always well-staffed during the convention. We have classes in the upper levels and the layout of those rooms are a little confusing. One big problem I've had is the cell phone and 3G connection (and even wifi). In the upper levels there are dead zones in several of the rooms. Must stand next to the windows to make a call. Other than that a pleasant space for people who insist on having conventions in Las Vegas.