Instruct: Classify a given Amazon review as either positive or negative.
Query: Odd to mount, but excellent rear view

I'm a little anxious about attaching the mirror to my glasses; my glasses seem kind of fragile compared to the wire frame on the mirror. Also, taking the mirror on and off my glasses (or wearing the mirror around in the supermarket) is a nuisance.However, once the mirror is installed on my glasses and I'm on my bike it's wonderful. The view to the rear is very clear and there is _no_ vibration. Also the mirror is closer to my eye than my previous helmet mirror, so there is a much wider view.Bottom line; kind of fiddly to put on and off, but excellent in use.