I recently got 2 orders of the matte skin from BestSkinEver and used them both for 5 months or so. One MacBook Pro 13inch 2020 4Tb and One MacBook Pro 16 inch. I was pretty happy with both of them so I just placed another order for the 3rd one (for the M1 MBA that is incoming). I used to get them 7 years ago and remember that I enjoyed them but since then changed to either a case or dbrand. But lately, I've gotten tired of taking the skin out every time I have to sell something since I assume people do want to know how the laptop looks underneath the skin. Therefore this year I went all-in on matte for easier resell (not have to take it off before reselling).
All 3 times that I purchased the products this year they ship within 3-5 days at the latest and it shows up about 5 days later, not too bad for free shipping. The very first skin that I did get from them in May had some big bubbles after installing so I emailed them and they replied to me within a few days offering another replacement if I were to cover the shipping. I didn't ask them how much was the shipping since after a few days the bubbles look better than before and I figured there was no need for another skin.
Overall I am happy with the look and feel of the skin, the customer service to me was decent. I can only speak for my own experience but I guess I am happy enough to purchase 3 of them within a year