I gave up free skis to ride them....
Honestly, I've mounted all my skis for the past few years, these cores are the smoothest, yet sturdiest cores I've ever drilled into, easiest mount I've ever done. They're light, and the quality is amazing...I haven't ridden them yet, but it's one of those things you can just tell by touching them.
So...yeah, buy them, you wont be disappointed.