I agree that adjusting the mirrors properly will allow you to see a car approach from behind at which point you can watch them in your side mirror, but they DO NOT help in the case of (1) heavy traffic where you're not watching cars approach or (2) you're not watching every car behind you.
For example, tonight I was in congested traffic traveling at the speed limit and I got aggressive because the guy in front of me was going slow and I saw an opening to the right. I checked my mirrors and (tried to) look out the right window and took off to the right. Nobody was there. The second I started to change lanes I saw a gigantic pickup truck that was in my blind spot. I ended up cutting him off.
I'm seriously thinking about getting those stupid half round mirrors for the sake of not wrecking my Z.
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