"Smooth boost" anyone ??

There's a product I've been looking at called " Smooth boost " it looks to me a little like a controlled leak basically if you turn down the boost but I wanted to know if anyone is using one and likes it?

I've not used that particular product, but being able to operate a supercharger bypass valve independent of intake manifold vacuum could have merit.

What's your setup and what would you be hoping to achieve in using the product?