yesterday I finished my blades in the dark campaign, and it was one of the best ones I ever ran.
the system took a little while for us to get used to, but once everyone knew the all the options and all the rules it was both smooth and consistently fun: my players loved dreading every single roll, and I loved coming up with consequences, offering hard bargins, mounting ever-increasing odds against them, and watching them plan (retroactively) elaborate ways of beating them, while improvising upon unforseen events.
at the beginning of the game the characters were weary and careful, but knowing every single roll can succeed let them take crazy risks non, by the end of the game most rolls succeed, but because of that they took MORE risks, so whenever they failed the consequences were dire. it worked beautifully so there was always pressure, always risks, always crazy stunts and always huge problems to plan around.
this is a wonderful game, and I personally rank it as one of the best game systems I've ever played.
I could write a book on the things BITD does right.
the game world is very cool and interesting, but the system would easily lend itself to other worlds, and while I enjoyed it, I probably had enogh of this world in this one campaign.