From a quick search, it seems there are several general purpose machine learning packages in Python (Orange, mlpy, scikits.learn) and even more specialized ones. Does anyone have experience with more than one of them ? How do they compare to each other in terms of features, maturity, performance and community ?

From a quick search, it seems there are several general purpose machine learning packages in Python (Orange, mlpy, scikits.learn) and even more specialized ones. Does anyone have experience with more than one of them ? How do they compare to each other in terms of features, maturity, performance and community ?