We've eaten at Tony's once, quite a long time ago, but from what I remember of it we both enjoyed the restaurant quite a bit. I wouldn't hesitate to go back, despite the bashings I hear other people give it.
We've only eaten at Biergarten once as well, a few years ago. While I enjoyed the restaurant, especially the desserts, my Mom didn't feel the same way and doesn't want to return to the restaurant. I thought the entertainment was quite nice, and for a buffet the price can't be beat. I do hear a lot of complaints that they sit you with another family that you don't know (as they do in Germany), but I didn't mind.
Chefs de France, again a one-timer for us, had good food when we ate there for lunch a few years ago. Our server was kind of "off" and had the personality of a wet-mop while we were there and something just didn't seem quite rite. I'd go again though, and hopefully get a better server.
We ate at Yak & Yeti shortly after its opening and though the food was out of this world delicious, I have to admit I was a little shocked at this restaurant... and not in a good way. I was probably over half done with my stir fry meal I'd gotten for lunch when I found a jagged piece of metal in my food. It looked like a really thick staple or part of a woman's bracelet link that had broken off. I'm just thankful I saw it instead of taking a bite and it cutting my mouth open or ending up swallowing it and having even more problems. The server offered to bring me an entire new dish of food because of the issue, but I said no, because I was nearing full then anyway and I knew I couldn't eat another entire plate of food.