They are as reliable as you make it, if you start treating it wrong then it might give you problems, They can be made to go quite well, We currently have a vr at work that has a GT30 turbo bolted onto it, I have seen v6 commodores with boost light up the back wheels on the highway at 100km/h, I have had quite a few commodores but the vs executive I had was fairly heavy on fuel.
What is your plan with it?