I just purchased the K-Sports and they're sitting in my trunk. I was hesitant to buy them given their low low low low... price. I mean if you look at it on paper these are comprable to JICs and are even more adjustable than most Teins (actually way better than anything that Tein offers for our cars: basic and SS pshh).
But my initial look at them is that they really do look great. Quality is a thumbs up as well. I just found out that their company overseas is called D2, which I have heard of in Hong Kong. They have a very nice shop in HK. So these guys are not totally unknown, and they do have racing exp.
check it out:
http://www.d2racing.com.tw/
http://www.ksportusa.com
I'll be installing these this weekend, and hopfully they'll satisfy my expectations.
Oh yea... Buy that ebay auction, I bought mine for $670 and I thought that was a good deal already. =T