Everything you ever wanted to know about dash cams can be found at
Dash Cam Talk. They review almost everything available.
They named the
A118 the "Best Discreet with Screen." They named the
Mobius camera the "Best Discreet." The Mobius appears to be smaller, but of course it has no screen. They have pics of them side by side on the A118 page. The A118 is the one on the left in the top left pic.
I'm glad you posted this. I have a higher quality cam for my windshield, but I've been thinking of getting a cheaper rear-facing camera as well. I think that A118 would work really well in the corner of the rear window.