Bad filter damaged my lens.
I have been a customer for a couple of years and have purchased a tripod, several bags, and filters. The 95mm filter glass separated from the metal ring and left a permanent smudge on the center of my 180-600 Nikkor lens from rubbing against the glass, significantly affecting the value of the lens. I didn't bother to contact the company because I don't want a replacement filter that I don't trust and I know the company will never compensate me for the damage to my lens by replacing or repairing it. I don't recommend buying their filters.