I also check if the store explains how to measure PD and frame size clearly. On the other hand, a well made pair of glasses can last a long time and feel comfortable all day. A simple pair of glasses or a basic jacket that always works is worth a lot.
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:
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Very thin fabric may be fine for summer but often looks cheap and becomes see through. I enjoy reading threads where people honestly share what worked and what failed for them. Now I am more careful with impulse buys and limited time offers. Otherwise they become clutter in the closet after the trend is over.