If the first order goes well, I slowly try more products from the same place. I am still learning and testing different brands and styles over time. If tracking never updates for weeks, I start to worry about the order. Bad lenses can cause eye strain, reflections and headache when you wear them for hours. I prefer simple designs that do not depend only on heavy filters in the pictures. 
 
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:

click here

 
Many times I avoided a bad purchase just by reading a few careful comments. I like when they mention whether the fabric has stretch or not, that detail matters a lot. Very thin fabric may be fine for summer but often looks cheap and becomes see through. If tracking never updates for weeks, I start to worry about the order. I also pay attention to return policy and customer service response time. 
 
Just sharing my personal feedback.