Quote:
Originally Posted by PropellerHead
If you set aspherical mirrors properly, you can see three lanes to each side!  Even the 17 vs 45 degree pics above show proper adjustment- with the edge of the car just outside of the reflection. That's nearly 2.5x the reflected area of a standard mirror. If the idea of a mirror is to reflect as much area as it can providing the most information ab what's back/over there, it's impossible not to benefit from the wider angle glass. 
I agree with others here that they are one of the best things I have done to my X5. I wasn't adventurous enough after 7 years in my 3.0 (sworn no mods on purchase), but I still enjoy in my E39 after 14 years and only 5 or so in the 4.8. The more the mirror reflects, the more you see.
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The way I was taught to set side mirrors was to lean over next to the window and adjust mirror until you just see the edge of the door handles. You don't need to know what your door handles are doing do you? You can then see three lanes between the side view and rear view mirrors. In fact when vehicle is coming up in the lane next to you, you can see them in the rear view and just as they are about to disappear from the rear view they will appear in your side view. But, to each their own.