From now on I will point people to this thread when they ask what FUD means :)
Seriously though, BitKeeper is a very well engineered and implemented piece of software. It is neither stable or buggy. It's being built by a team of very experienced engineers. About half of the code base is consisting of regression tests and they have a big lab with machines and a bunch of different operating systems so they can run the regression suite before shipping. They know that SCM is a delicate thing -- it can decide the life or death of a software company -- so they got it right.
Please people, please do not spread false things about things you didn't had direct experiences with. Especially when those things put the said product into a bad light.