It saves a lot of trial and error for everyone else. Some care only about style, others focus on comfort and durability. A product that still looks good after a few months is more impressive than something only good on arrival. Sometimes I still make mistakes with size, so a friendly exchange policy is very helpful. That is why I sometimes leave comments myself when I test a new shop or product.
If anyone is interested in real user experiences, I sometimes write short notes about the shops I test.
You can find one of the pages here:
see more details
If the first order is a disaster, I prefer to move on and not waste time with support. It makes it easier to compare with an old pair of glasses that already fits well. Now I try to read as many real user reviews as possible before I buy anything. Footwear is even harder because different brands cut shoes very differently. Trendy pieces are fun, but I only buy them when the price is reasonable. Recently I have been testing several online eyewear shops to compare frames and lenses. Whenever I find something that actually works well, I tend to reorder it later. Sometimes I experiment with different materials just to see how they feel in daily life.
Just sharing my personal feedback.