Omni Chicago, lost quality since last visit.
I have stayed at the Omni off an on over the years. On business, for personal trips. This trip started off quite rocky, and left me very un-impressed. 
1) Be aware, they have a new policy where they charge debit card $55 per day for "incidentals" which you *may* incur. They do this if you elect not to use a standard credit card. Even if you have booked and paid for your room in advance. The desk clerk claimed "all the hotels do this now"...funny how when I put a remote employee at the O'Hare hilton on my business debit card, I was never asked for additional funds. Having a policy is one thing, spreading blame for it is another. While not a problem for me, someone who plans trips down to the dollar and dime might encounter a problem with this "policy" of theirs. To my knowledge, they never did this sort of thing before. (I don't use Credit Cards, its why I have money in a recession. =))
2) Rooms were clean, but their in room accoutrements and mini bar items had no price list. The only thing labelled with a price was a bottle of water (about 600 ML) for $7.50. As such, be careful with the tray of goodies. If the water is $7.50, imagine what the snickers bar might cost. 
3) Our suite had a bathroom sliding door between the bedroom and bathroom which appeared broken, and would not move. Calling the front desk resulted in ... nothing. Finally about 9:00 PM I elected to have another look at it, and it seemed to be off its track. I was able to successfully "fix" it, but the lack of response from maintenance, considering the rate for a suite, is sad. I remember this hotel being much more attentive and responsive. 
4) The seem to cut a lot of corners on room stocking now. 
Overall, I think I will be skipping the Omni, and they will get no more of my business. It seems Hilton treats people better overall. It's quite sad, as I have a lot of good memories with Omni. I will not be back.