If you shoot photo (or specifically video) outdoors in the sunlight, you NEED a variable ND filter.

For video, if you're shooting 30 FPS, you need to keep your shutter speed at 1/60 (because of the 180 rule) for natural blur and smoothness. If you want a nice blurry background at f/2.8, even at ISO 100, there's a great chance your image will be horribly exposed. Your only options are to increase the shutter speed (and compromise the natural look with distracting "choppiness") or crank up to f/16, which will flatten your image and get rid of that blurry background you wanted!

In comes the variable ND filter. When applied, like variable sunglasses, it allows how much light passes through, kind of like an intimidating bouncer at a night club. So just twist the ring on the filter and you can achieve your shot perfectly!

With this specific filter, two small things bummed me out:
1. The ring doesn't have actual stops, just continuous rotation so you can't really keep track of the specific amount of light you're letting in.
2. When the filter is on my Tamron 28-75 2.8 lens, I can't put the lens cap on at the same time. Not a deal breaker, but annoying when you want to quickly take a picture or shoot some video.

But for the price, it's hard to argue this isn't a great purchase.

This is a product I chose after reading the reviews. It is highly recommended for starter photographer. The adjustable feature is definitely.
I have taken multiple photos with and without the filter, and will different settings on the filter, and I can see the improvements in the results.

This item is worth buying for the price, I tried it out and it seems to be working fine.

The filter does its job without much colour shift. Not bad for the price.

For me this filter fulfills its purpose and it is currently the best filter at this price

Fits perfectly to my Sigma lenses. The workmanship is very high quality. I find the padded box that goes with it very practical. The filter can easily keep up with the expensive ones.

Price-performance ratio. Doesn't have a dark "x" like other variable ND filters. Image quality is also very good. Would 100% recommend it. At this price you can't go wrong.

Everything looks good, it's raining today, I can try it against the sun, quality and price are ok

You can get into photography with a variable long exposure at an unbeatable price. Ideal for photographing waterfalls, rivers, the sea, clouds, this filter allows you to smooth the subject. With a single filter you can manage multiple opacities and thus a larger aperture of the lens. All you have to do is rotate the filter and in the end this filter is simply an indispensable accessory for the amateur photographer.

the cross on the ends is pretty strong, more so than with other nd filters I own