As you can see from all these replies very equipment specific. I don't believe Paul was issuing a blanket leave it on but rather if you have standy mode then use it as it keeps the electronics consuming little power but ready to perform quickly at peak efficiency.
Leave it on?
I just listened to Paul McGowan explain that turning SS equipment on and off degrades the capacitors from the tiny power surge and that leaving SS equipment on ALL THE TIME is best. What do you do?