We go at least once every trip. I love the flank steak and Picanha. They are open on Fridays for lunch at half the price (with no lamb chops or filet).
I only go when I have a coupon so I get one before each trip (multiple e-mail addresses come in handy at times like this). They also give you a coupon for just signing up (I think 25% off), so you can wait a week or two before you leave to sign up so it will still be valid during your trip.
When you sign up, make your anniversary conveniently falls during your next trip so you get the BOGO coupon. At about $48 plus tax and tip each, the coupons really make a difference!