The last two 5" double extra slim saw files I used didn't look too good out of the package, the edges were rough and one seemed to come to a raised ridge (probably not too clear with my weak photography):
DSCN1610.jpgDSCN1613.jpgDSCN1611.jpg
The edges seemed to "crumble" pretty quickly when I actually used one of the files to sharpen a backsaw, again it might not be too clear:
DSCN1612.jpg
Grobet files were my plan B after Nicholson files went downhill, and I don't have a plan C. So I'm really hoping it's a one-time glitch.