I agree with this... the Take a Look Mirror claims that it can be attached to the helmet visor but that doesn't work. It's designed for glasses and VERY effective installed on glasses. It's easy to install if you need to switch glasses (takes maybe 10-20 seconds tops to put them on the glasses and adjust them). I've never tried a handlebar mirror but the fact that you can simply pivot your head slightly with the TAL glasses mirror to scan what's behind you makes it difficult for me to believe there's a handlebar mirror that can trump them.