So Silvermax is a little more contrasty than APX 100 and the Adox developer is soft working. Nothing there that can't be handled by D76 or Rodinal. I did a quick calculation and worked out that the Adox developer would cost 53p per film to develop and D76 at 1+1 20p. That sounds like a big difference but is less than a penny per frame for a 36 exposure film. However, it all adds up. Ten films developed in D76 saves enough to buy another film. Personally, I'd have to see something special in the Silvermax/Adox combination to set D76 or Rodinal aside.