Overall this is a really good set of filters for this price. The set includes a UV, CPL, and ND4. I am a photography instructor and put a video unboxing with this review and some sample photos of average use.

UV filters are used to cut haze. It was effective at this but the effect is not as dramatic as seen with other filters because most cameras have UV filtering built into the sensor. Unless you are at a location with a lot of haze (cityscape, mountains/high elevation), you may not notice any difference at all. The CPL filter is two pieces of glass that rotate opposite one another to block glare. This set's CPL does a very good job with reflections on water, foliage, and glass. The ND4 offers two stops of light reduction. This allows you to shoot in very bright conditions or to use longer exposure. ND4 is a good level for someone who is starting out with landscape photography. Eventually you might want a variable ND or NDs of different strengths.

If you are a beginner, casual photography, or overall camera enthusiast, then this set is a great way to learn and experiment with filters in photography. If you are already advanced or want something with even better performance, then check into K&F's X or XPro series.