Being Sensible
The standard CBR mirrors are only good for admiring your elbows; I now understand why some sportsbike riders remove them completely. Not me though, I want to know if there's po-po behind me before carrying out any sensible and legal manoeuvers*
So, I bought some generic mirror extenders from eBay and now I SEE ALL. Yes, they look a bit daft, and make filtering a little more difficult, but it's worth the trade-off.