Customers most agreed on the following attributes:
I'm using it mainly as a lens protector, although it does reduce haze. I also found it easy to clean, would much rather clean this than an expensive lens surface.
Works as an stay-on lens protector filter. I leave it to add extra protection plus a hood for the lens. No signs yet of effecting the picture.
Great lens protector - easy to clean with a multi-coated finish. Creates clearer skies and reduces haze in city shots.
I got some of these in different sizes. Unfortunately, one of them wasn't built correctly. The metal ring holding the glass in the mount popped out. No big deal, just popped it in again.