I was worried that they would could have burrs or other minor manufacturing defects given the low price, but are very well made. I installed them on my Creality CR-10s Pro V2 because it's my first time running it, so I can't comment on the change in noise levels, but the loudest thing about this printer is the fans. They have a very smooth movement. I installed the top through the top of the bracket so the screw is perfectly centered. A lot of people mount them at the bottom but I see that as worse as the screw won't be in the middle on each side of the portal. Overall very easy to install but you will need to realign the gantry and bed. For the price I don't see why you wouldn't install them.
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