Hard to say ... but illegal immigrant construction workers have brought the wages for carpenters, painters, roofers, etc., way down. Made my house cheaper, I suppose, but I still wish our gov would enforce immigration law (but that's another thread entirely :-).
At the risk of moving off tracks, I think unless you see a hardcore fringe leftist everyone in NZ regards stands supporting illegal immigrants to be able to get driver's licence or take welfare benefits as lunacy, even if they agree with or even go to the left of Howard Dean on every other issue.