I usually install the screen protector in a dust free environment, and it works. If I had to complain about anything, it would be the cable - this one feels stiffer and appears thinner than others Ive used. I found these and bought them before I realized that they are more expensive than the replacement tips directly from Apple. The bottom of the shoe fits perfect. But it’s not really that big of a deal, and I can give this Logitech pen my highest recommendation. The cotton doesn’t unravel. Im very impressed with the price and quality. Left ear bud worked first time I got them out of the package and they werent fully charged. I think I’m still in the middle of it, so I will give the shoes a fair chance and update my review as time goes on. com (an Amazon seller) they would not exchange the shoes without having to pay return shipping.