Supercharger?

hi there. i am planning to buy a 2008 scion tc with supercharger installed by the dealer which is gonna cost me almost $3200. i barely have any idea about super charger but just know that it will give me more horse power. my first question is the supercharger bad for cars? do i need any other modification if i install supercharger? is the car gonna take more gas? is it worth it for $3200? or should i just get a good intake? is the car gonna output 200hp(super charger) + 160hp(stock) = 360hp in total. thank you in advance for ur istance