The flavor is real.
I'm giving Del Frisco's Grille four stars, even though I doubt I will return. The food was absolutely fabulous, and the wine selection was epic. We were there during a slow time of day, and the waitress talked to us a little and was fun. I would definitely say that this is a 'classy' establishment, however, and had it been a busier time of day, would have felt very under-dressed.
Check out my picture for a pepper burger and fries, which I highly recommend. Their tuna taco appetizer is also perfectly done - crispy shells that almost make it a messy explosion, but somehow manage to keep all of the deliciousness together.
All in all, I would recommend Del Frisco's Grille for a classy date or to announce your engagement, but I wouldn't just stop by after shopping.