It's just a substitute for lowering springs. You could go that way, there's not really any strong reason not to. It will change your alignment, but it doesn't matter what kit you buy, you're going to have to get your alignment fixed. Lowering any vehicle, in any manner, changes the alignment.
Do some research on your vehicle, some vehicles will require a special alignment kit when lowering. My car for instance, generally can use the factory alignment hardware for up to 1.5" drop (or so), if the car is lowered around 2" then an aftermarket alignment kit must be purchased in order to get the alignment within the factory specs.
If your car requires the alignment kit when lowered 2", it doesn't matter in which manner you lower your car; it will require that kit to bring the alignment back to factory spec.
Build 'em Light and Wind 'em Tight.