You're terminology tells me you have no experience of how hard it is to get bodywork to look right on a car. that company will tell you anything to get another kit sold, what do they care, they dont have to come over and fit it.
they will tell you a "mechanic" can fit the body kit, what they dont tell you is the hours and hours a bodyshop will take blending in the seams and making it look right before painting. this isn't cheap.
another thing is, your insurance will go up, as its a modification and if you have an accident, it will be much more expensive to repair properly.
you'll get bored of it after a few months and wonder why you wreaked your car.