I just discovered that Micromatic have discontinued their premium regulator series for both the primary and secondary regulators. This was my favorite type of regulator as the construction is rock solid and it has a nice twist knob with a locking ring that you can use to prevent accidental adjustment of the pressure.
They have replaced the premium with the premium plus series. This is just is a nicer looking version of the economy regulator. It requires a screwdriver to adjust the pressure and it doesn't have the knob or locking ring. I'm not sure how this is a "plus." There's a company in Australia that still has some of the old premium regulators in stock, but I can't find anywhere in the US that still has them.
The images below show a primary single with the old premium regulator compared to the new premium plus in a double regulator secondary configuration.
They have replaced the premium with the premium plus series. This is just is a nicer looking version of the economy regulator. It requires a screwdriver to adjust the pressure and it doesn't have the knob or locking ring. I'm not sure how this is a "plus." There's a company in Australia that still has some of the old premium regulators in stock, but I can't find anywhere in the US that still has them.
The images below show a primary single with the old premium regulator compared to the new premium plus in a double regulator secondary configuration.