Hand Cannon Online has an article up talking about their experiences with the Secret Weapon Washes line.
From the article:
I recently placed a large supply order from Secret Weapon miniatures. Amongst the things I ordered was their entire line of washes.
Not having used them before I decided the best way to learn how they worked was to try painting an entire unit of models with only the washes. And I cam very close. I only had to use three colors of paint after my primer and those were a bleach bone, a gun metal and black.