I've got mine in. It was easy to build and install. I have done a little soldering in my time, and i used a wiring diagram to find the right wires to splice into. The boost comes on hard and fast now, with my rb25 turbo on the rb20 i get about 14psi at about 2800 rpm and it holds spot on all the way through the rev range.
For 150 cash you cant go wrong.