As most areas of the USA now have nice riding weather, I think this thread needs to be re-started.
Not with the yes-vs-no-mirror-usage-or-fred-vs-notafred-issue but with some photos of products, or a "best of" list of available mirrors that those who use them can share (re-share).
Not happy with the models of eyeglass-mount mirrors out there, I made my own. Here's a photo for you to copy to make one too. Or check my signature below.