This is one of the more innovative applications I have seen in some time. It makes both organizing and finding data much less painless. I have accumulated over 600Gb of disorganized documents, videos, pictures, and other stuff. It would have taken me a long time to organize that mess with finder and Quick Look. Within about an hour and half I was able to organize my mess with Leap and can now find stuff much faster.

The early beta version did crash on me too. However the later beta versions and the full production versions have never crashed on me.