I went today (thursday) for lunch and ordered a sirloin. They brought me a thin cut small piece of some stiff and dry meat that looks like it was cooked on the microwave.... so disappointing! When I asked the waiter if it was really sirloin (250gr) or it was a mistake, they offered me to switch it for a t-bone instead and I agreed. This time the portion size was right, but it looked like they defrosted a pre cooked piece of meat (see picture attached).
In conclusion, I wouldn't recommend anyone to go there for meat... at least not during the week. Beside that, the service and the place are excellent, but it was my worse experience in a Mexican restaurant ever.