Wow, that guy has strong opinions on lots of things and he isn't afraid to share them. (did I understate that adequately enough?) Edit: but the dtrace part is

Wow, that guy has strong opinions on lots of things and he isn't afraid to share them. (did I understate that adequately enough?) Edit: but the dtrace part is very good. Around the 1 hour mark he starts demonstrating using dtrace to instrument the python parser. Good stuff.