I've just finished a game which included a broken ladder that was played out (intentionally). It wasn't quite Lee Sedol, but still!
The ladder itself starts being played out at move 53, but there are preparatory moves too.
My reasons justifying the ladder were: that it was quite short (8 moves each, I think), although still long enough to be catastrophic in normal game conditions; I had some surrounding positions to support the resulting weak stones; and I also made sure that I got the move before and after the ladder to play an extra supporting stone on each side to make catastrophic weaknesses playable. I would be able to fight for life inside and the stones on the outside should be able to link up and/or run, and hopefully give me some good influence. That said, I fully expected that it might actually be revealed as a clear overplay and end horribly, but once I had seen that opportunity, I felt that I would regret it if I didn't at least try.
I was hoping to get some thoughts on whether or not people think that the ladder was good for one player or other, or if it was a fair exchange, and also how well each player dealt with the fallout or what we should have done differently. I thought at the time it was probably close to a fair exchange for our levels. It turned out really well for me in the game, but I suspect it might have been harshly punished by a better player?
Some points I've already come up with: The G4 J4 exchange immediately before the ladder is probably a bad exchange for white; and both players, but especially black, should have played away earlier than they did (move 103 is particularly bad, I think). Looking back on it, the outside group was very weak at first (black really should have just killed it), I should probably have tried to find a slightly different variation where that group came out stronger, or perhaps more flexible.