Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Best rear mirror I have used

I bought one of these first to replace broken a bar end mirror I broke. I like that it lifts the mirror higher than the bar so it is easily visible. It is more stable than most mirrors I have tried, and easy to adjust in each desired dimension. I also use one on the left to hold a "Serfas Stop light" led light on the left bar end to provide a wider look to the bike when cars pass me at night. It turned out to be an easy way to mount the light. When I bought the second one for this purpose, I thought I'd have to glue the light to the back of the mirror, but I screwed the light mount to the mirror mount with only a little filing of plastic. The mirror is also mounted and I can use the mirror during the day, and the light at night. BUT the light is too heavy with the batteries in it, and it causes too much bouncing of the mirror to be useful. So I will remove the mirror and use the light only on the left. I still have a "plain" mirror on the right, and it works great.