I ordered this a little while back, mostly for use with a Dragy. I figured I'd stick the Dragy unit itself in the sunglasses holder while having my phone mounted so that the camera points forward.
This hasn't worked out for me, mainly because Topfit screwed up. First, they only sent me the charging phone holder, not the rubber one, but it was non-functional. Since it didn't open up on touch, I couldn't get my phone into it, much less charge it.
When I complained, they sent me a replacement, but not of the broken part, just everything else. It was an entire unit, with the rubber phone holder but without the charging one. This did nothing for me.
Frankly, I don't think they understand English well enough to grasp what my problem is. They've promised again to send the replacement, so we'll see.
The other problem, at least for me, is that the sunglasses holder is this silicone rubber that's too slick for adhesives to work on. I tried to stick one of the metal plates that come with the Dragy into the bottom of the holder so that it'd be firmly in place, but it slid right off. I guess I could stick the plate onto some cardboard and jam it into the holder.