Honestly just depends a lot on the maintenance habits of the owner and what you are or are not willing to do. If you clean it pretty regularly, your spray wax choice or sealant choice is generally good enough for your windshield. If you don't, then a glass coating can do wonders for you. Have to choose the right product and apply correctly to avoid wiper skip and stutter. We use GYEON View and GYEON quickview. Quickview is definitely the more consumer or DIY friendly version. Super easy to put on and take off. And it depends how much weather your vehicle sees too.
There are just a lot of factors that go into it other than "this product is crap and didn't work the very first time I tried it."
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