TERRIBLE Service
This hotel is proof that no matter how "nice" an upscale hotel is, it is not truly upscale if the customer service is dilapidated. 
I've booked here twice now. The first time, I had trouble with minor requests (asking for additional towels, finding out how to navigate the mall from the front desk, request for an hour late checkout, which was refused, flat out.) 
This was to be my second stay. Unfortunately, my friend who I am visiting in Texas underwent emergency surgery earlier this week and I'll not be able to go to Dallas anymore. This reservation was made with Hotwire. When I contacted the hotel, they told me as long as they had "fair notice" when the Hotwire folks contact them, they'd be able to cancel the reservation (the stay is in 4 days.) I called Hotwire and they spoke with the front desk perhaps 15 minutes after I had. The woman at Hotwire was kept on the phone on hold with the front desk for 20 minutes and told me they were "rude" to her as well. Eventually, after Hotwire got nowhere but were clear that the front desk was being uncooperative. They refunded me my money and apologized to me for the behavior of the Westin. If you think about staying here, think again.