Amnesia,
There is much good info on this thread but I will add my own experience as that seems to be what you asked for.
FWIW, I have been on various brands /doses of statins for almost ten years now. At the same time I have been taking a low dose aspirin daily as well. I tend to have both cramping and muscle pain since I started taking statins.
My experience is that my body does not react to all statins/doses in the same way. One year I ran a spring marathon. After I experienced muscle soreness. In the past, after running a marathon, the muscle soreness would last 2 to 3 days. After this race the muscle soreness did not go away for over two weeks. After consulting with my Doc we decided to stop the statins. Immediately the muscle soreness went away.
I have also experienced severe hamstring cramps since being on statins. This can happen both while running, the middle of the night while sleeping and occasionally in the pool while swimming.
Since then we have experimented with different brands and different doses and found what seems to work for me.
Good luck
Steve