One of my favorite Marriott properties
The JW in Chicago is hands down one of my favorite stops when staying in Chicago. I like the touches that the hotel offers over and above the typical Marriott experience. A great business hotel!
The rooms are well-appointed, although not exceedingly large. Comfortable and easy to maneuver is the rule of the room. The meeting spaces are nicely done, and technologically able. The Executive Lounge is the highlight here, as it is probably the top scoring area for Elite members at any Marriott -- beating even the Hilton New York. The food is outstanding. Not too heavy, and well thought out. Elegant space, but comfortable.
There's an interesting parallel here around F&B, though. After 10 or so meals on property, I have found the F&B service at the on-property restaurants to be pretty par for the course. This could use some work, honestly.
The gym is pretty well laid out, but the pool is extremely small. I like to work out there, but don't plan on getting a hardcore workout. Also, no laps in the pool. it might be 15m at most.
Finally, the event experience is expensive here. We staged an event for approximately 500 and it ran into the six figures. Bring your checkbook here, but I believe it's worth it.