I got my Z supercharged last spring. It totally changes the car and I'm really happy with it. However I'm more of a track junkie so 400hp that my lightly modified HKS kit gives is enough for me. Power delivery is smooth and just like NA, only more. What you don't get is a big kick to the back seat like with an tuned turbo car.
With that said a V3 on stock block might not last that long. Be prepared to spend some £ if things go wrong...If you track the car or drive hard you will also need an oil cooler and radiator.
So if it doesn't suck up your every penny to buy it, do it. If need to take a loan to buy the car I would forget FI. Testdrive might be dangerous. There is no turning back after that