Meh, the VG30 is a great motor, it was designed as a turbo motor, so in an NA application it's a dog. but it's still less of a dog than a ka or an sr. stock for stock, NA to NA... the VG is better and more powerful motor. Add boost, and not only is the VG better, but it'll make more power, and do it more reliably. People are just too cheap to do it, and do it right.
I know someone who had a turbo KA or SR in his 510, can't remember which, but he swapped it out for an NA vg30. sure, didn't quite make as much power, but he said the car was much more fun to drive.