I have experience with some Mapleshade products (not the Samson) and have been very impressed. That said, I would like you to also consider the Sistrum racks by Star Sound Technologies. Im just a happy owner of this rack who can testify (along with many others here on Audiogon) that it works and works extremely well!
Besides remarkable performance, another nice thing about the Sistrum rack is that once you place your components on them, you no longer have to add any tweaks above or below them. I believe that with the Samson and other similarly designed racks, its still recommended that you use cones below and brass cylinders or other devices on top.