I've now got about 120 miles with my Take A Look and I absolutely love it. I have decided I won't ride on the road without it.
Stating the obvious...
I can see cars coming before they get to me. I can edge over to the left if they're not giving me enough room and suddenly move back to the right just before they pass. That way, I get a safe amount of space.
I often drag my kids behind me on a Trail A Bike and/or in a bike trailer (often both at the same time). I can easily keep an eye on them.
I can see my tail light reflecting off the roadway. It's reassuring to know the batteries haven't died.