Indifferent service - charges for everything
Stayed here for a work trip in July. Reasonably good location, 10 mins walk to Magnificent mile, 15 mins to the park.
Very dark lobby - not cheerful at all. Really don't understand the use of dark glass, where the natural light would have made this place so much brighter. My room faced the office building on the side, and had to keep the blinds closed most of the times. Meaning I couldn't really enjoy the very limited slanted view of the river, for more than few minutes each morning. 
Service was quite indifferent. From the check-in, to check-out. The craziest thing is that they charge to receive postage. I had ordered somethings online and had them delivered to the hotel and was charged $5 per box ($15 for a larger one). Was the first time ever I've been asked to pay for receiving packages. Really very disappointing service. Even though I am a SPG plat and big fan, I am considering avoiding the Westin chain altogether going forward.