It took me 9 years of sailing the Nacra 5.2 to finally pitchpole it. It happened very quickly but was not nearly as violent as when I pitchpoled my Prindle 16. I was not sailing with the bow submerged. I just hit a piece of chop wrong at high speed.
The boat did a cartwheel. Nothing Broke.
I righted the boat in less than 1 minute.
Most Important - check where your crew is before unhooking from the trap line in the water. The D-ring goes flying. I remembered, but I think that is the most dangerous part.
The pitchpole is not as violent as spinning out and catching the rail on a windsurfer.
We love the 5.2 - especially my Wife. It was the first sailboat she ever sailed.