I got the K-sports on my car for a few days so i'll give it a quick review.
I'm not even sure what spring rates I've got on the car because i bought these off of another forum member. I remember reading that you can specify what spring rate you want when you purchase the coilover. You can buy other spring rates as well separately.
On first impression they ride pretty decently. Whatever spring rate i have on the car right now it feels a lil too stiff for everyday driving. I can deal with it, but its just a lil more than i'd like.
Performance wise they are great, no roll whatsoever. The car feels planted and it really gives confidence. My only complaint is the way our Proteges were designed. These coilovers were made so that you can change ride hight through the perch. But because our endlinks connect to the damper itself, you can't utilize the hight adjustment through the perch. This makes kinda limits the adjustments for suspension travel, damper stroke, and corner weight adjustments =T What I'll get in the future is adjustable endlinks so that can fix the problem.
Otherwise these are great coilover for the price. If people are having troubles finding these and don't know where to order. You can still order them from D2 overseas. I don't know whats going on with Ksport USA. Kinda worried about the warranty and all.