Received it in the post today, the clip itself was on back order but this was explained to me at point of order so no problems.
Comes in two parts, the clip that attaches to the A-pillar (no tools required, leaves no marks) and the phone holder itself. The centre screw you can see tightens around a ball pivot so you can adjust the viewing angle, and the smaller screws on the left and right allow you to adjust the width of the phone holding wings and lock them into place.
The phone holder attaches to the clip itself with four small screws. If you look to the right of the right hand phone wing, you'll see two small pilot holes in the clip - there's six pilot holes on the clip so you can position the phone holder left, centre or right of the clip.
The clip slides up and down the A-pillar easily so you can position it where you like within limits.
PROS:
> Easy and quick to assemble and install
> Solid and well engineered, no sticky pads or flimsy plastic, should hold up well
> Works well, phone held firmly in place and at correct angle for driver
> Adjustable to suit preferences
> Location on A-pillar doesn't block air vents or dash controls, less visual clutter on dash, but doesn't obscure view while driving (although too far from 12v socket for most power cords)
> If you change cars, you can just get a new clip and reuse the phone holder, and vice versa if you change phone brands / types, get a new phone holder and reuse the clip
CONS:
> Expensive but as I said, well engineered and solid - this is not a cheap phone holder
So thanks for the recommendation, overall very satisfied and it will save me a lot of faffing about on the road.