Yes! Take full advantage. I went yesterday to MAD. Next week Mastros.
I would not recommend doing any of the brazilian places as you don't get as good of a deal. They are always a flat price for all you can eat and it doesn't seem like you get a break with restaurant week.
You get the best bang for your buck going to an overpriced restaurant where you would normally not want to pay that much to try everything and this way you get the full courses.