Coilovers vs Eibach springs and Koni's

[rice_killing_GT]

What are the differences other than cost and adjustable ride height?

Are there advantages/disadvantages?

[PTGT Redman]

depends...
koni's front and back will run you almost 500-. add for a set of eibach's say at about 150-200 for the set, gonna run you 600-800 bucks. coil overs vary in cost but probably at least that much or more.
btg coil overs are 1099, but there are even some more expensive systems

[rice_killing_GT]

but other than cost and adjustable ride height, why would you want to put coilovers on? is there a big difference in ride quality?

[COP TZER]

unlike springs, coil overs do not lower the car by reducing over spring height. Coil overs are a sleeve system allowing full range of motion of the spring in its natural setting rather than having an over compressed spring. I personally prefer springs over coils over just because the way i see it is that the less adjustable moving parts you have, the less can go wrong. Some coil overs tend to be bouncy also