Did it yesterday. Good cadre. Well formed. Very much reminded me of selection without the being weeded out. Everybody that went was in shape for it, but even then it hit some hard. I didn't quite come straight off the couch, but I could've trained a little more.
Sore today in the expected places. No blisters, no cuts, no bruises.
It rained the ENTIRE time of our event which was 14+ hours (and 33 degrees out). There wasn't a dry spot on anyone including cadre who at the end said that it was officially his coldest Goruck ever.
If you do it, don't take it lightly.