Just ate there last monday. We got lucky and got an 8 PM reservation, same day.
Very busy joint. Bustling with after hours business people, out of towners, people on a special dinner, and a lot of regular Chicagoans just out for a great meal.
Very friendly bar staff who seemed to know lots of the regulars. We were there with cousin on her 21st birthday and he comped our entire round of cocktails ( 6 of us in the party )

Tons of staff, everywhere you looked but they never seemed to be hovering.
Great head waiter who was very helpful in selection of our steaks.
Had the NY strip. Very tender and very flavorful.
Sides are huge. Mashed potatos and twice baked were fabulous.
Try their house wine ( which the waiter recommended. He said it was better than anything else they had to offer and I agree )

Great huge dessert cake, which was fabulous.

My only gripe was that it was crowded and the tables were sort of close together, but given the quality of the dining experience I can understand why everybody wants to eat there and this, it's crowded. What can you do?

PS: we had made the profound mistake of heading to Gene and georgetti the day before.
WHAT A DUMP.
Worst food I've ever seen. Avoid that place and eat at Gibsons, presuming they can get you in!

this place is GREAT!!! the steaks are cooked perfectly, EVERY time. this should be a given at a steak house. here it is!!! the staff is always awesome. don't miss the deserts, especially the macadamia turtle pie WOW!!!!!! every time a go back the experience is equally GREAT!!!!!

I've made my second visit to the Gibson's Steak House in Rosemont and had the house special ribeye. The steak was done perfectly (charred on the outside, warm center). The rest of the meal was also well above average. I can recommend Gibson's highly on that score.

However, if you want a quiet romantic dinner, this is not the place for you. It is noisy and tables are packed close together. This was not a problem for the dinner party, as we were all business colleagues and wanted steak after a long day of meetings, not romance.

I visit Chicago two or three times a year, and always make it a point to eat at Gibson's. I have never had a bad meal or a bad experience. The wait staff has been uniformly helpful, courteous, and professional. I always make a reservation in advance, and have always been promptly seated. Steaks are fabulous, garlic mashed potatoes out-of-this world, and desserts so enormous (and tasty) that I always end up with a doggy bag for my pie. It is true, as noted by one reviewer below, that tables are close together, and the place can get very noisy; large parties at big tables have to shout to be heard, and that makes Gibson's even noisier--I think I would go elsewhere if my party had more than four people in it. However, for great steak, great service (I've never felt rushed), and good people watching (early in 2005 I was there and Muhammad Ali was at the next table--a big thrill), Gibson's is tough to beat.