Yet I have had many m20's die from their crap psu. So yes, they run well, but power supplies are also junk. They are bricks now because you can't get the p11 psu's anymore.
Could there be an issue with your electricity setup? The psu on this gear had more dust than one can imagine, the voltage was far stable but usually within 190-220v, what is your ac voltage?
By the way, if you are interested in buying them from China i can help you locate some.