Doug I've used PMK pyro for some years now and like many others it has served me well both for 4x5 sheet film and 120 roll. The only time its let me down is with 35mm and this is more a problem with 'streaking' caused by inproper agitation. So for 35mm I've started to use Pyrocat-HD and this certainly has improved matters with this format. However for sheet and 120 roll film I'll be staying with pyro for the time being.
I print only on VC papers and with split grade printing these pyro negs. print so easily.
All the best,