Played with shedskin a while ago.  Great product, great community.  Really exciting to see them moving forward.<p>I don't think comparing to Unladen or other JIT tech is appropriate.  The real use for ss (in my opinion) is to replace the prototype-in-python, optimize-in-C++ workflow.  Now it's prototype-in-python, optimize-in-python.  Yes a few edge cases need handling (esp if you want the real speedup; avoid things like lists with random types) but the end result should be greatly improved productivity and code readability.