The only ones I have ever seen were the ones I got from AMP. It has just been a bone of contention all the way back to the late 20th century. We had a big discussion about it back when Harold was called "The Caper" (1995 or so). Joe Tedesco was the one who was most vehement about hating them. I have seen the same thing get fights started at IAEI meetings here.
It is just the idea of a flying NM splice buried in the wall that does it, in spite of the word "fished" in 334.40(B).
