[meanguy]

I converted some old, overcomplicated, YUI-inspired javascript that relied heavily on class inheritance: big win. I converted some events-gone-nuts code that talked to Google Maps: not a win.

The productivity issue that nobody seems to talk about: the damn compiler is slow. We're talking seconds, but it adds up. (The CSS compilers are far worse.)

I'm used to save/refresh/boom! when coding HTML. Now it's save, contemplate what the hell could possibly take so long, stare sadly at the compile output window, tab, reload, oops, reload again.