Im going to put one on my scooby had anyone had any experince with one of these unit are they any good?

 

Fantastic if you use them correctly (ie they are not a cheap way to get more power, but are excellent at preventing boost spikes while getting a quick spool up).
Easy to fit, connect elbow end to actuator and straight end to the small pipe after the turbo. Block off all other pipes that you disconnect with bolts and tighten with extreme caution.