Chicago definitely worth a visit - Sax Hotel - 3.5*/4*
Just spent the weekend in Chicago with my other half and stayed a couple of nights at the Sax hotel on Dearborn Street just on the Northshore.
The hotel is about a $30 taxi ride from Chicago Midway Airport and is in a great location for the down town area - very near the banks of the Chicago River, many restaurants and bars, Millenium Park and a few blocks from the Magnificent mile shopping district. The hotel staff were polite and efficient and were happy to try and get us a room with a view of the river as high as possible. We managed to get a room facing south on the 7th floor, with an obstructed view of the river, which was better than nothing, but they were fully booked so couldn't provide anything higher than the 9th floor. The hotel room was clean, of a decent size and had a comfortable king-sized bed. The iron and ironing board were provided and worked well, and the bed-side radio, TV and in-wall safe all did the job. 
A couple of points were a little disappointing notably stains on the curtains, no bed skirt on our King bed, and given that the Hotel is located directly across from a multi-story tower car park, the occasional car alarm being set off at inconvenient times was not ideal. We were put next to a room with a baby in it, which, as babies do, had moments of crying. I guess the hotel cannot be blamed for this, but the walls were not sound proofed so the cries could be heard intermittently throughout the first night. No problem on the second night however.
We were most impressed with the concierge service (and reception staff). She had excellent information on where to eat and what to see in Chicago, and she was kind enough to book reservations at our chosen restaurants and provided us with a printed booking confirmation. The restaurants and bars were great, and Chicago could be my favourite city in the US after this trip. Will have to return to confirm!
Overall, I'd give the hotel a 3.5* rating primarily due to the location, the staff esp the concierge service and general cleanliness. I also thought it was good value for $100 per night. 
Recommendations for Chicago:
- The Frontera Grill - Rick Bayliss on Mexican food is exquisite and true to culinary roots. The Goose Island beer is some of the best I have tasted. - 5 mins from the hotel and very reasonable.
- The 96th Floor Lounge at the Hancock Tower - north end of the Mag Mile and good for a Strawberry Daquiri (according to the Mrs).
- The Gage Restaturant - Madison Avenue across from the Millenium Park - Interesting variety on the menu, good service and excellent wine selection (the Nebiolo was excellent). The bar wasn't too bad either.
- The Rock Bottom Bar on Grand - Good sports and house beer selection. Mexican starter combo was good. Busy and a little slow on the service though.
- The Tribune Tower - Interesting items in and on the inside and outside walls.