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I've never used them, so take my information regurgitation for what it's worth.
The purpose of these is to restore the factory bump steer, camber curves, and roll resistance after you lower a strut suspension. You can make the statement that they are required whenever you lower your car. But they aren't adjustable like Robi's are so in reality they're pretty limited to the amount of lower they would work well with.
So this make the when part pretty subjective. RCE posted a while ago that they designed their yellows around the idea that these wouldn't be used. They did this by using front springs rates that would increase the roll resistance despite the car being lower, and keeping the amount of lowering to an area that would maintain good bump steer and camber curves.
That said, some of the other kits don't use springs as stiff as RCE and lower even more. Those springs may well benefite from the correction kit.
I just want to mention again that I haven't used these, but my understanding is that if you use this with most of the springs out there, these would have a similar effect to adding a slightly larger front sway bar. I'm saying that because within the range that most springs are going to lower the car, the bump steer and camber curves should be OK so the main effect will be roll resistance. If you're going to lower your a lot they'd probably take the car from being very squirly and unpredictable back to confidence inspiring.
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