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Lush is great for numerical prototyping, much better than MATLAB/Octave. Its matrix/tensor engine is one of the most awesome (as in being in awe) pieces of software I've ever come across. It is definitely mature and well-tested in that niche. It was created by leading neural network researchers.

Outside of its niche, it's pretty useless.

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I don't quite get the faith Lush seems to inspire in some of its users. It's terribly documented, has antiquated semantics (no closures), and isn't even type safe (you can segfault if you pass an object of the wrong type). I might consider using Lush when performance was absolutely critical, but otherwise I don't think it holds a candle to Matlab for prototyping.

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