The Bell® FlexView™ handlebar mirror attaches easily and without tools with a simple mount. The convex mirror provides a wide angle viewing area and the flexible arm allows for easy adjustments.
I purchased this mirror at one of the Tampa stores so, unfortunately, I didn't have the benefit of these reviews. It's a Bell product, which is typically a good brand name, but it's boxed such that you can't tell how flimsy it really is. The problem is the flexi-shaft, which is so unbelievably flimsy that the mirror flops around when riding and there's simply no way to tighten it or firm up the shaft. While inexpensive, it's simply useless; a complete waste of money.
The person who gave it 5 stars hasn't taken out on the road yet - this will not stay in place and you will constantly be adjusting it for proper visibility. It IS better than nothing but not much.