We had a really nice meal at Del Frisco's, with great steak as many other reviewers can attest. The sides were also excellent (we had green beans and lobster mac n' cheese).
Service was pleasant and attentive, but always seemed to be going for the upsell which was fine but should have toned down once she realized the type of things we were interested in.
The disappointing part for me is that there are a few different rooms at the restaurant - some more boisterous, some quieter, and one with a live musician. We were seated in a quieter room which was nice since it was just my husband and I, however the decor was fairly bland and outdated with a grayish wall paper and mirrors. We had made a reservation several days in advance, so we weren't "overflow."
The ambiance of the meal made me feel like I was in a more casual steak house, rather than one that serves some of the best meat in town. With steaks that are $40-$50 (not including sides), I expect a bit more in the ambiance department.