Looking at other turbo kits and SC kits, this is a pretty good deal. All said, with the owner's labor it's about 5500 dollars at 250whp easily upgraded to 300+ for a few hundred more. The advantage is that you have an engine that's built for forced induction and with fuel upgrades you can run 18psi with no problems.
The downside is that there's a lot of labor involved so it would be best to start with a car that's not your daily driver.