Personally, bought a few of them before. But none of them the oleo coating ever lasted 3 months. Never like it, after which it leaves lots of fp marks all over. I know it’s cheap, and the price for 1 WSD we buy is s$33 could have bought 6 of it. But the oleo coating is really poor.
Been using WSD since s9 era till now. Most of them lasted 8 months or more in terms of oleo coating. Not only the installation is easier as it comes with all the necessity items to make sure chance of failure is Low, it is also more accurate for the glass to be positioned correctly. Unlike china made ones, having to rely heavily on skills to align it properly, I rather not. If glue not handled properly can be a disaster also.
To have a peace of mind, WSD is a lot more convenient and towards full proof considering that the jig and the things they provide are to protect from uv glue sipping into the phone gaps and speaker phones etc.
I had the same belief as you last time and spent so much on WSD and was disappointed. Shall not rant on my experience but I'm sure you get the idea how frustrating it is to find a suitable protector for curve screens.
Now a days oleophoic coating are very good on protectors from china. Take for example ibywind, cheap and long last oleophoic coating. Lasted longer than my ringke ones on my pixel 6.
Anyway if you are ready to put in some money for wsd, why not give taobao oness try? You might be in for a surprise.