I spent a summer living in that building. It's very lovely and graceful, though I like "suavely-curved" much better as a descriptor! The views are unmatched, IMO, still. Breathtaking.
Back then its only drawback was that it was very removed from the activity of the city. It was a bleak walk for several blocks to get back into the hustle of daily life in a city. These days it's surrounded by smaller scale housing, retail, and the much-improved Navy Pier, yes?
RIP, sir. Among buildings that would be considered timeless, this one readily comes to mind. Its sitting on its own, pushed out toward the lake, give it a very stately appeal, not to mention this "me vs. this menacing, windy lake" tug-of war effect.