I did some searching and people thought there were design issues with the Ksport. Hopefully Rara will chime in on that one.
I had two main design issues with the Ksports.
1. No retention tab for the strut to knuckle. Stock, and most aftermarket struts have a tab that drops down into the slot in the knuckle, and the pinch bolt passes through a hole in the tab to prevent the strut from pulling out of the knuckle. Now, normal loading of the strut is in the opposite direction of pulling the strut out of the knuckle, so its not LIKELY to be an issue, but, under the right circumstances, such as a hard impact to the wheel, or a very rough road, could lead to the two coming apart. Again, not likely, but the severity if it occured is VERY HIGH, most likely resulting in a serious crash, and a totalled car and potential injuries.
2. Poor sway bar end link mounts. The retention of the sway bar end link mounts is not solid at all, it consists of a threaded sleeve witht he mount attached, and a locking collar above and below also threaded to the strut body. If the locking collars loosen at all, the mount is free to rotate around the strut and into the wheel envelope, which may lock up the wheel and result in a crash. This one is far more likely to occur than item #1 above. Many coilover shock makers use this style of design, and it scares me. Koni uses them for the struts on the Koni Challenge Mustangs that we run, and I've seen two $140k Mustang race cars destroyed because of that design. On our cars we have since made some additional changes to ensure that the swaybar mount can not possibly move. A couple of options are to use red locktite on the swaybar sleeve and on the locking collars, and to use an additional locking collar both above and below to prevent the first locking ring from loosening. We also inspect them and retighten them after EVERY session on track, which is basically after every hour or so of driving.
Those are my design concerns with the Ksports, and both are relatively easy to fix if you have some suspension knowledge, common sense, and some fabrication resources.
My other issues with them are they lower the car too much for the stock geometry, and that they are too harsh for street use. Though, as much as they lower the car, you probably want them extremely stiff, because the easiest bandaid for poor suspension geometry is make the spring so stiff that the suspension doesn't move
not a very enjoyable ride though, lol.