The only concern i would have with these cheap chinese coilovers are those adjustment nuts, if the car see's winter its best to spray some kind of penetrating lubricant on them so they don't seize. I had to pull my shock recently, put it on a vice and use a 4 foot monkey wrench + torch to loosen the nut.
As for the adjustability, the kw's are nice only if a) you actually know what you're adjusting, b) are racing and need the adjustments.