My neighbor shoots them on his crossbow bolts and he hit two deer this year and could not find them. He swares both were good hits, but obviously I can't be 100% about that. I was thinking of switching to mechanicals until his woes started. Then I figured, if it aint broke, don't fix it. Just my $0.02.
This has been rehashed over and over. Your friend did not make good shots. If he had he would have two filled tags for this year regardless of the broadheads he used.
I do agree with the if it ain't broke part. If your broadheads are working, why switch?