It worked/works great for me too.
Simple and effective.
I was surprised that the more lead you put on there the more resistance though. I used a no.2 pencil and set my vcore down to 1.5(bios) and it reads 1.48 in the hardware monitoring(bios) and programs.
Before I'd set it at 1.5 and got 1.456.
And stable across the board when loaded, no drop at all now.