If you can have a shop inspect it and the carfax is clean, it might be. I wouldn't do it without an independent inspection, once you're sure you have genuine interest in the car. Find your best local import or Subaru shop.
It will be better if you can find a privately owned car and talk to the owner. A big win would be if you can talk to the owner and get the vehicle inspected. I'd be cautious of a dealer starting this STi at such a low price.