Is this a good deal? 10 Points!!!!?

i just bought a brand new sony xplod 1200 watt 2 channel amp, 2 sony xplod 12 inch 1200 watt subs in a box, subs were used but amp is still in package. i bought it for 150 bucks. it sounds good but i was wondering if i overpaid and would a 1 or 2 farad capacitor be a good idea? Thanks