the chip usually is around $400-500, and its a smooth curve in power distribution, better acceleration, better horse power and torque, use the factory turbo with a slightly more boost but very safe, also because of the consistency in the power band sometimes gas mileage is increased.
The disadvantage is that some flashes are ok with warranty, some are not, and most chips are not, and becareful at the dealership to not let then flash ur ecu to original then you will have to pay for chipping/flash again