We also used the lunch vouchers in september. The restaurant wasn't busy. The service was excellent. Our server was very friendly, very attentive, and of course, very helpful with having us order the most food possible with our vouchers! We used 2 for 2 people and didn't eat much else that day. Our 2 year old slept through the meal.
I'd say the food was mostly very good. We had 2 different salads (loved the tomato stack), 2 different steaks (the filet was better than whatever huge one DH ordered), a side of mushrooms, a side of asparagus, 2 smoothie type drinks, 2 desserts (one with an additional side of ice cream) and 2 coffees (maybe 1 espresso?). We ended up taking some food back to our room.
Maybe we were just lucky, but our server was very happy to help us out. As soon as we sat down I showed her the vouchers and asked what we could get on them. She guided us through every course

Now, maybe if we had only had 1 voucher & were splitting, she would have been less thrilled, as it would be half the dollar amount for her tip. Even if we planned to tip extra, she would have no way of knowing this up front.
We had also heard mixed reviews, but for $60, it was worth it to take a chance. You'd pay about the same for a buffet (with tax & tip).