Just got these ND filters for my Osmo Action 4 and I'm seriously impressed! The press-on design is genius - no more fumbling with screw-on filters in the middle of shooting.

The Gorilla Glass construction feels premium, and the rubberized edge keeps them securely in place. I was worried they'd fall off during action shots, but they stay put even when I'm mountain biking.

The included case is super handy - compact but protective. The ND8/16/32 combo covers all my daylight shooting needs. Video looks way more cinematic now with proper motion blur!

Only downside? They're a bit pricey compared to some alternatives, but the quality justifies it. If you shoot outdoors a lot, these are worth every penny.