Underwhelming. First of all, the ambiance of this place is terrible. It feels like a steak cafeteria with a giant, open floor that's very noisy. It's not intimate at all so it pretty much rules out ever going on a date here. They also had some cheesy music playing.
The food was decent. In particular, I thought the complimentary warm pretzels and the mac and cheese were outstanding. For my steak I decided to go with the ribeye. I feel that a ribeye is the best test of a steakhouse because it can be amazing if it's a good cut and prepared well but it's generally harder to deliver a great ribeye than a great filet. The ribeye was disappointing. Although it was cooked to order (medium rare) and had good flavor, it was a lot tougher than I would expect for a $40+ steak.
The lack of ambiance combined with uninspiring steak means I'll probably avoid this place (and the numerous other Mastro's locations). I wish I had taken my friend's recommendation and gone to Bourbon Steak instead.