I'm successfully using PyPy in production. It's about data processing. The most important dependencies: redis driver, beautiful soup.
PyPy cPython
jobs/sec ~60 ~8
mem usage 1.5G 2G
When using lxml on cPython, the jobs/sec increased to 10 (on that time lxml wasn't supported by PyPy, now it is). I really encourage to give a try to PyPy.
