Os Segredos is probably the best and most authentic Rodizio you will find in the city. Considering it's a Rodizio, better to go with a large appetite, since the cuts of meat are so delicious you will want more and more. We had a 7PM reservation, but had arrived half an hour before, and I think it was a blessing due to it being empty and the salad bar was easily manageable. Service was flawless even when the restaurant got very crowded, we had asked our waiter if they could bring out the roasted pineapple again and they very much obliged and brought it out right away.