Do you have a link to it on amazon? The only crystal spigen I know is this one I ordered a few days ago, and it's a 3 pack of plastic protectors. It works fine for what it is, but I plan to switch out for a glass one later if anyone comes up with a better solution for the curved screen.

I'm using one made by Spigen found here. It's barley visible (only around the cut edges), works with my 2 cases, no halo, no bubbles, no problem with the S pen, and it feels great. Comes in a pack of 3 for a total of $9. Here's all the reviews mentioning "halo."

edit: here it is on my phone. it's mostly visible around the button.