Here is an absolutely unbiased review: I was there for a National meeting, and stayed here even though the meeting was at McCormick place. I stayed in room 1014.
It is really dark and depressing in the room, and musty and dirty as well. The bed was way too short for me (i'm 5'11...not a giant), and when you sleep on the bed the bottom sheet comes undone immediately and isn't really fitted, and the comforter is cheap, not a nice down one. There's some dirty, cheap, leather pillows on the bed. The room is not well lit, uncomfortable, and the bathroom is cold and not clean. An old pack of Rolaids was stuck in the corner of the room (if the hotel reads these: CLEAN THESE UP!). It was a total of $300 a night... so overall, it was terrible. There are many, many better hotels that are actually much cheaper. Don't stay here, pick somewhere else. I spend much less in a Westin ---I left to stay here I was so sick of the SAX, and even though I don't think Westin's are that great, it was at least comfortable, with decent beds and shower. The SAX was cheap, dirty, cold, and overpriced.

We booked the Hotel Sax primarily because of the positive reviews on this site. Check-in was prompt, efficient, etc., rooms fairly spacious and clean. Only complaint would be a lack of storage - the hotel's website claims that a double double room sleeps 4 comfortably which is true but if they got rid of the outrageously overpriced mini-bar ( we did'nt indulge!! ) this would create more room. Only other issue of note was noise from a party in the room next to ours at 3.00am!!! which, when we rang reception to inform them of same, resulted in no action being taken as the noise continued for a number of hours. In fairness to the hotel they compensated us adequetly when we mentioned it the following morning. We had our 2 daughters with us ( 11 and 8 ) so could'nt make use of The CRIMSON LOUNGE but it looked like a food place to go. On an extremely positive note, my daughter's teddy bear was accidently caught up in the sheets and disappeared off to the laundry company, and after quite a number of phone calls both were reunited after approx 36 stresssful hours!!!! Hats off to all in housekeeping, front desk and even the bell boys for a great job. Checked out the STUDIO and it was a popular place to hang out. BIN 36 is also good for breakfast, evening drinks etc., We engaged the services of Katherine, the concierege who got us a 50% discount in tickets for the BULLS at the United Centre so all in all, we would use the hotel again. 3 internet ports in the lobby proved very useful also.

The Sax was just perfect for us. We got a fantastic deal through travelzoo for $109 which included free parking and two drinks at the bar.
Checked in early and requested a Chicago River view, which was awesome, we got to watch the river turn green from the comfort of our room!
The staff across the board could not have been more helpful. Our room, while not huge was comfortable, clean and well appointed.
It was so great to walk next door at night and catch a show at The House of Blues too!
The hotel bar was swank, comfortable and the staff was wonderful.

I LOVED the Hotel Sax! I stayed here for 3 nights for a business trip, and spent most of it in the hotel because of my meetings and the bad weather outside. My 14th floor room was large with a nice view of the Chicago River. It had a very comfortable beds, fluffy towels, nice bathrobes, and great toiletries. It was silent in my room -- I couldn't hear people in the hallways, the TV next door, or the traffic outside. And despite being on the 14th floor the elevators came very quickly. Good wireless connections, and free Internet access with printers in the lobby so you can print out boarding passes and the like.

One minor complaint - The room is lit by about 6 lamps, so to get the lighting level I wanted I had to walk around the room and turn them all on.

My only complaint about value is the fees tacked onto the room service bill -- I order a $9 salad and $11 pizza, and got a $36 bill. They also have the snacks and mini-bar drinks on some sort of touch-sensitive tray so that they know when you touch them, which is a bit much.