i've used a apexi boost controller,

1. fitted in my cossie,
2. fitted in a pulser.


Tuners told me it was hard to use, but i found it quite easy once i'd played with it for a while.

Compared to my Air inj, Boost comtrollers are quicker to setup, and can do different boost for different gears, Which my Air inj and S8 cant do..

Also seen Greddy ones, and they are ment to be the cheapest/ and easest to set up, but very basic compared to the Apexi or Turbo smart..