Never heard the M5000 but the Dreams are great, especially if used throughout the system.
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Agree with Tbg.
Best I've ever heard in power cables, and not by a small margin.
In fact, I had a pair of large SET amps here, which sounded slightly thick - even a tad muddy, especially in the bass.
Utterly transfomed the amp's "thickness", and it's overall dynamics, immediacy and liveliness.
The Dream is the only power cord that has managed to do that.
To be honest, though, that was with Dreams everywhere else in the system.