So it’s my understanding that as you lower a car, the distance between where the endlink mounts to the front sway bar and the strut body shortens. As the stock front end link is non-adjustable in length, it applies more pressure to the front sway bar as the car is lowered from stock height, effectively loading up the front sway bar even when the car is at rest. The adjustable end links allow you to properly adjust the length so that there is no “pre-load” on the front sway bar at rest, which allows it to function throughout its full range of motion when driving.
Honestly driving around down after install I couldn’t feel a difference but I haven’t done any sporty driving with them yet. For 150 bucks and how simple the install is though I thought it was worth it.