This library is awesome, I am a massive fan of randomized and quick-check style testing. This type of testing has for me found so many bugs its surreal.
I love the fact that hypothesis is a proper quickcheck and not just the fuzzing part, and that the author has a crazy stack-based-vm-language-testing thing project that might be useful.
I have been using this library with py.test for 6 months now and its been a godsend.
If I ever meet the author I would buy him beers.