I’ve used the Osmo Action for a few months now, mainly for the kids football matches and the odd mountain bike trail. While the camera is top notch, bright days can make the footage look a bit amateur and blown out. I picked up this ND/PL set to try and get a more professional look, and they have barely left my camera since.I think the build quality is great for what you pay. The filters use the same screw mechanism as the original lens cover, so they feel solid and won't fly off. The glass is easy to clean with the supplied soft cloth.Functionally, having the ND and polarizer in one is a massive time saver. You get four filters ranging from ND8 to ND64, which covers everything from a typical grey afternoon to a rare blast of bright sunshine. The lower ones are great for getting that smooth motion blur on the kids running about, while the stronger ones are brilliant for cutting glare off the water during trips to the coast.In terms of value, it is a bit of a no-brainer for any dad wanting better family videos. They are waterproof, fit in my existing case, and cost the same as a couple of pizzas. If you want your holiday clips to look more cinematic by lowering the camera shutter speed without a load of messing around, these are definitely worth a shout.