to the actual coil over, there is no Con except for price.
there is a lot of suspension setup and geometry knowledge needed.
you need to know what your spring rate are going to be; example main spring, tender spring.
understanding of link seperation values, squat and anti-squat values, etc..
Honestly, it is not a simple as installing a bolt on long arm kit. if you have never consider building a double triangulated four link from scratch, it is something best left to experts.
