I haven't had those problems, but I finally got around to getting a mirror and wonder how I did without it all this time. I tried the Mirrcycle bar end one for a while and I liked the view I got from it, but mine started getting loose and it always seemed to be in the way when I'd move my hands from the grips to the bar ends for a rest. I kept bumping it. Also, although I don't often squeeze between cars to get up to the bike box at lights, the bar end mirror made this more difficult as my handlebars were effectively wider. Getting in and out of my apartment and its elevator was more difficult too, as well as rolling up to crosswalk button on the opposite side of the street I have to press to make it across a busy intersection (light doesn't recognize bikes). In short, I wasn't a fan of having my handlebars be wider.

Lots of people swear by the Mirrcycle, and a couple of brands of ones that attach to helmet or glasses, but I was concerned with the small sight picture with the latter types. I eventually shelled out about 40 bucks for a Safe Zone mirror. I really like this one, I'm sure it might seem a little big to some folks, but I get a nice sight picture in it, with that being just above my left eye. I can turn my head to bring things into view that would be otherwise out of view with a mirror fixed to the handlebars too. This comes in especially handy when out of the saddle climbing. I bump it sometimes when I take my helmet off, but it is easy to re-orient and doesn't shift at all due to road vibration. It took a bit of force to assemble, but I'd be willing to bet that it is going to last a real long time, and I like the aesthetics of it.