The mirrors arrived while we were on vacation! We got back last night and I went for an 18 mile bike ride today and used the mirror.
You are right, it takes some getting used to. I found that I have to squint my right eye closed to look in it. That's a little awkward at first. But I soon got the hang of it.
I didn't trust it at first and I kept scanning first and then looking in the mirror to see if I could see there what I'd just seen by scanning. Then I started checking the mirror and confirming by scanning what I saw in the mirror. By the end of the ride I was comfortably using both scanning and the mirror.
After 1 1/2 hours with the mirror, my opinion is that it's going to be great for rural roads, but I don't think I'll use it much in town. So for my situation right now, which is that I live on a rural road just outside of town, this is perfect.
I did one thing that was really funny. We stopped to drink water (I'm not a big fan of drinking on my bike, though I can do it, I prefer to stop.) I was startled because I thought there was someone behind us and I spun around--it was our own shadows behind us that I'd glimpsed in the mirror!
2009 Trek 7.2FX WSD, brooks Champion Flyer S, commuter bike