I've used Kentona in Neutol WA and Ansco 130 with excellent results (as well as with Ilford Warmtone and Multigrade devs) so I very much doubt your friend's problem was typical. The paper has been widely used for years so any such "blotchy" problem would have come to light many moons ago.

Personal experience tells me that 99% of the time when I have had a problem with any negative or print it was my fault, not the material's fault...

Cheers, Bob.