Replying to FKS Worth It?

I have super weak knees. I had a close call the other day (super man front gone wrong) but luckily I had taken judo for some time and I rolled out of it still with one ski on.Is the FKS worth the extra money? I'm almost 16 so I'm kinda on a budget. (My parents don't spoil me rotten like some kids parents tend to do. My all mtn skis have 2 mounts with Axiums. Would they even work now? And are the FKS mostly hype or could they really save my knees?