The take-a-look mirror easily swivels in all directions and works on either side of helmet or glasses. I've used mine on my helmet brim for at least 5 years, I commute daily and its been banged around loads of times and is no worse for wear.
For a Brit or anyone with the possibility of riding on different sides of the road, it has a clear advantage, and the traveling two review exactly reflects (sic) my 5 years using one regularly in very busy riding environments.