I went to Tango Sur last summer with my wife and another couple. We all really liked it. Granted, none of us is all that up on Argentinian food. I've had a fair amount of Chilean food, but I won't compare the two because one thing I know is that Argentinians don't like to be compared to Chileans and vice versa.

But all in all, the portions were very big (not inexpensive though), and quite good. I liked the BYOB as we were able to enjoy 2 of our own bottles of (not so good) wine for free.

I will probably go back this summer.