Congratulations... I purchased a folding full suspension mountain bike in 1994 (that has quite a few miles on it) and then two 29er's in 2010 so you have me beat
Give the brakes a bit of time to break in and if you do not notice more responsiveness, purchase a can of brake kleen from an auto parts store and carefully/sparingly spray it on both sides of the brake rotors (avoid overspray on the hubs) and the inner sides of the brake pads.