I attended the NRA trade show last weekend and stayed at this Hyatt for two nights. First, let me say that the public areas were very nice. The employees we came into contact with were FANTASTIC, especially at the front desk, housekeeping and gift shop/convenience store. Definitely a typical Hyatt experience - UNTIL you walk into the room. OMG. If you blindfolded me, took me into the room, took the blindfold off and asked me what hotel chain's room I was standing in I would have to say Holiday Inn. This is not to say that the Holiday Inn is in any way a terrible chain - but Hyatt standards are most definitely not met in these rooms. For the over $200 per night charged it doesn't even come close to being acceptable. The closet is even covered by a CURTAIN. There is no safe in the room (for a business hotel?), no magnification mirror (small annoyance), the towels were so thin and dare I even mention the toilet paper? I'm sure some prisons use softer toilet paper. Forget the coffee too - ugh, the room had the single serve piece of plastic junk coffee maker that drips out one cup of (horrible) coffee at a time in about 10 minutes. Most of the hotels at this price range also offer WIRELESS internet access (some without cost) but I was tethered to the desk and had to pay an additional $10 for 24 hours of internet access (or take my laptop over to the convention center where it is FREE).
If you HAVE to stay here, it is convenient to the convention center and the rooms are kept very clean by a wonderful housekeeping staff.
Perhaps it is because I am used to our Florida Hyatts that are impeccable and luxurious that I am aghast at this particular location. I saw many hotels in the downtown area that would put this hotel to shame - and it would cost the same to take a cab out to the convention as it did to take a cab out of the convention area to downtown (where there is absolutely nothing to do after the convention closes each day). If you have to pay more to stay downtown it would be well worth it - IMHO.
Frankly, this should not be called a Hyatt - nice standard hotel, but not Hyatt.

Stayed here for 4 nights during a tradeshow in March. Booked a standard king room and was upgraded to a Corner Suite (I am a Diamond member with Hyatt).

Check-in was fast and efficient. The staff was friendly and very professional. For those attending a trade show at McCormick Place, you cannot beat the convenience of a 5 minute walk from your hotel room to the exhibition area.

The rooms are very clean and up-to-date as far as modern furnishings go. (LCD tv, nice furniture, decorations). The bed is very soft and comfortable - perfect for resting after standing all day during a trade show. The bathroom is somewhat small, but great nonetheless. Noise was not an issue, although you could hear the occasional sound of doors closing in the hallway.

The hotel is located right next to McCormick Place, which is situated south of the Chicago downtown area. If you're visiting as a tourist and have no business at McCormick, I recommend staying elsewhere. Otherwise, you will be spending money on taxi fare or spending 15-20 minutes walking to the downtown/Magnificent Mile area.

I tried the breakfast buffet at the restaurant downstairs and it had a wide selection of good food with great service. The bar/lounge was ok but service was poor, most likely due to the large crowd of tradeshow visitors.

I would stay here again only if I had to visit McCormick Place.

Just returned having attended a conference at McCormick Place. The hotel itself is clean and 4 star quality. There is a skywalk on the 2nd floor that leads right into McCormick Place so it made going back and forth very convenient. As other readers have pointed out, as long as you have business at McCormick Place, it is the place to stay at for sure. The only challenge is the hotel is not near anything else (I did discover a McDonalds about a 5-10 min walk). I did make the use of the hotel shuttle into town but it only runs up to 6 pm - it dropped me off downtown and I managed to take the bus back (the #3 bus by the way). Overall, I had a very pleasant experience.

First the good. Bed was excellent, with very good pillows although sheets were thread bare. Good desk chair. good hotel if your entire stay is for convention next door and you just want a place to sleep while being at convention center.
Negative: Not what you think of as a Hyatt. We were booked by mistake at this hotel, thankfully able to change to only for a one night stay. We could not wait to check out. Nearest restaurants are in Chinatown, a $7 taxi ride away, and they are poor. Would rate this hotel a 3* at best. Bellman watched us unload luggage from limo and place it on curb and only then did he offer assistance. Wall paper peeling in room and hall. Anywhere there could be dust, it was there. Drab, cheap decor, as previouly noted closet door is more like a shower curtain. Bath amenities (almost none) were 2 star, not 4 star at they think of themselves. The TV was neither a flat screen or HD (understand suites have hdtv) and it must have been as old as hotel, which I would guess is about 10 years. Internet so slow as to be almost unusable.