You all have more refined palates than I do -- I don't differentiate between tart and sour -- let's put it this way, if someone said they didn't like sour, I wouldn't have offered them that drink, even if I did understand the difference.
On topic -- I almost bought a La Fin du Monde last night, but had to put that and a bunch of Paradoxes and a bunch of Black Holes back -- just too many beers to buy. I will try it one of these days, but since it's available closer, I didn't think it was worth buying it there just because it was in front of me.
Did you know they have a bunch of different variants of the Mikkeller Black Hole -- regular, and several different barrel-aged varieties (wine, rum, etc.).