I'll be honest. I'm not a huge fan of NoGi Grappling other than the fact that there's greater emphasis on the takedowns and leg attacks (which terrify me, truth be told).
I have a hard time imagining the nerve it takes to compete with some guy trying to literally to explode the inner workings of my knee (on purpose). Though, heel hooks are legal in MMA and I fought 5 times. I was never much nervous before my fights b/c I knew I'd trained hard and believed in the work I'd put in. I suppose at that level, it's much the same.
At any rate, the ADCC is coming up and some of the contingents/teams are dialing in their last minute preparations: