they bend and break billet and hotrod cranks,so i doubt there doing any better..they just dont tell you!!
i have replaced rods,retrued,reweld,and installed over 200 cranks in banshees and even more counting 4strokes and dirt bikes
and i have never seen cranks snapp rods like the 29l/r
i know all about these engines...big and small
maybe you should go take a look in the back of a PROSHOP and see how many damaged cranks are laying around