Saw them 4 or 5 times.
Last time was in a small venue in Paris last september, kind of secret gig announced only a week before etc
Really one of the greatest Interpol show I've seen. Excellent.
They were really in it, and so was the crowd (not speaking during songs...

)
If possible, you must see them in a small venue rather than in a big one or at a festival. With them, it makes all the difference...