I've been using a helmet mirror (Third Eye variety) for 3 years now and can't imagine riding without one. I remember when I first put it on though and thought it was worthless. It took me two long days of riding to get used to it, but now it is totally, totally second nature. So give it a few tries before giving up on it. In fact, now when I'm hiking or skiing I forget that I'm not wearing my bike helmet and find myself trying to look in my mirror to see where people are behind me. I don't think I would like the handlebar mount because of the same reasons others have mentioned. One, you can't lay your bike down without messing with it or breaking it (although, with the helmet mirror, you do have to be careful not to throw your helmet around), but the main reason is you can scan all around behind you (cars and bikes to your left and even riders behind you on your right side) by turning your head which you can't do with the handlebar mount or you will be riding off the road. I highly recommend a helmet mirror. I havent' had any trouble with vibration with the Third Eye but my riding buddies have had some vibration issues with some other brands.