I used to crossfit, and I think it's awesome if it fits your goals (it used to fit mine), those goals being well rounded fitness. It either amuses or confuses me that people hate crossfit, let love challenges like this one which is essentially the same thing. Crossfit is a challenge every day - be it burpees for time, or a mix of say powercleans and pullups. It's good fun to race other people. And it's even better when combined with a strength program. I combined it with Wendler 5-3-1 with great results, but now I'm following more sport specific programming (State Basketball).
I've done it before when it was one of the crossfit WOD's, I'd have to check my journal for time - probably about 10ish.
Sorry if i took the thread off topic