Yea the drop is modest, which is what I personally wanted, but it's not for everyone. I will split the Koni's from the swifts if you wanted to throw on some H&R's or M7 springs, but yes I will be selling the V2's in a couple weeks.
According to Swift's site, they are linear http://www.swiftsprings.com/file/ss.pdf 5k front / 5.5k rear
H&R's are similar - basically a linear spring with a wound "helper" section. The tighter wound section compresses when the car's on the ground.
It's all about who can make springs cheaper for the masses. Swift like a few handful of other good manufactures actually have ethics and a QA department.
Not sure what you mean by that, but I would love to hear why the different design's as I can assure you it has nothing to do with quality.