I own an Opal mini & it is great! As someone mentioned earlier, it is how you apply it. A little bit is all that is needed. A person can use a flat precision brush to pat & apply on area you want some brightness or use a fan shaped brush to spread out the highlighter (say over the cheeks after using blush).
If I was getting this, Cashmere might be the correct foundation for me.
ETA: I just checked my Color IQ at Sephora & Cashmere is the correct shade for me.
☼The best place to seek God is in a garden. You can dig for him there. GBShaw☼