My friend has one. I don't like the look as it shouts out "look at me I’m cheap from ebay" however he has been very happy with its performance. The only thing I noticed is that it don't know/display vaccum
. If you’re at idle then it display 0.0 it's only when there is positive pressure it starts to count. I don't know how well/accurate it can deal with the boost control; I suppose you will need to see the boost graph on a dyno.