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I have a Hoya Pro1 CPL in my camera bag, but I rarely use it.
Do bear in mind that you would need to compensate about 1.5 stops when using a Circular Polariser in low light in manual mode. The camera should do this automatically in AF mode.
The technical experts here would give you helpful advice on how to use a circular polariser, and when and when not to use one.
Light travels in waves. To demonstrate this, go to your local sunglasses emporium and pick out two polarising sunglasses..
Hold one lens in front of the other and gradually rotate one. You will get to a point where the light through the lenses is blacked out completely. This is at 90 degrees to where the axes of the two polarisers cross - the maximum cut off point.
NOTE: A knockoff pair of sunglasses marketed as polarisers won't do this. When buying a polarising pair of sunglasses use a known genuine polarising one to test if the other one is genuine or fake.
A polariser lets light vibrating in one direction plane through. A second polariser with its axis held at 90 degrees placed in front blocks all the light coming through. If you rotate the second polariser, you gradually increase or decrease the amount of light getting through.
Essentially, a polarising filter will cut out 50% of light, so you would need to compensate for this exposure loss when using one.
I have a 55mm Hoya Japan UV(O) screw-in filter and a polarising filter (probably also Hoya) languishing in a camera bag. I doubt that I will ever need them again.
Polarisers can be useful. I used them for street photography and portraits, which is seen as unusual but often led to amazing colour saturation and a lack of blown highlights from reflections. However if you dial to max it can make people look dead as they lose the catch light in their eyes. (not an exaggeration, it looks truly weird).
For a landscape, again, can be good, can be bad and the ability to dial it in is essential.
I like round screw in filters more than square because they're quicker and easier for me to use. YMMV
I don't get much opportunity to do photography these days but if you shoot a lot of landscapes you'll definitely appreciate one as it cuts through haze. You lose a bit of light but not usually an issue for landscapes.