Tango Sur is good but not amazing. It surely does not hold a candle to the Steakhouses in Buenos Aires. Argentinian beef is unbelievable.
I would pick Think Cafe (also BYOB) on Western Avenue over Tango Sur. Excellent food and nice intimate atmosphere. This place is definitely a couple of notches above Tango Sur.
Hmmm - that's a tough call and a very subjective one, too. Some people still adore this place while others (us included) tend to feel that the bloom is off the rose and it's time to move on to other offerings.
The BYOB cost advantage is nothing nothing to scoff at in a a potentially romantic spot that serves impressive steaks at very fair prices. Portions are more than generous, but most of us can't resist the empanadas or cheese appetizers. The garlicky spinach-mashed potatoes are terrific. And steaks are served with a more than competent chimichurri sauce.
That said, if you go on the weekends you can expect long waits, slow service and a high decibel noise level - leading many to wonder, is this worth it?
You probably will enjoy the food and be thrilled with the bill. I'm just not sure there aren't better choices. Hope our fellow Chowhounds will weigh in. I feel like a real fence sitter on this one.