I was on 80mg of Zocor for several years, yes it got my colesterol down (diet barely altered my level).
But I would prefer to die earlier (there are other options ie. Ezertrol) than end up barely functional for years, fatigue, memory lose, pain in hands and feet, barely able to stand on bad days due to weakness, had trouble walking, and a dry cough.
Coming off Statins would show an improvement upto to the above level and that is where it left me for years, any dose level of any brand made the symptoms worse.
In my case there was a magic bullet that was found by accident Prednisolone, in a matter of days I became my old self, I have managed to lower the dose to 15 mg a day, I am better on a slightly higher dose but I am trying to avoid the side effects of this drug and playing around with supplements to try and get the Prednilone lower still.
I am even back cycling again, I dont know if I will regain my previous fitness level but it is great to be living again.
Cheers