Ive never had one blow up
Ive never blown one up either and Ive had atleast a half a dozen of them for full race seasons. I agree they probably blow up more than 2 strokes but they are far from the ticking time bombs people make them out to be. They are like anything else, if you dont maintain it... itll break.
I know Eric knows his engines. Im sure he loves all those broken motors coming to his shop, 4 strokes sound like good job security for him.