I started wearing a cheap helmet camera I bought off Amazon this week and I've noticed that close passes have dropped off to practically zero.4th puncture in 4 days and only one thorn found on day 2. Yes there must be another in there which I can't find but it no longer matters as they're going in the bin tomorrow when I fit the Marathon Plus. Also had a close pass by a VW Transporter who almost immediately then stopped in front of me because he couldn't get through the gap due to oncoming traffic. I would have been able to keep moving no problem if he had waited and he'd have got through just as quickly.
It's a bit bulky and boxy looking but weighs next to nothing and I don't notice that it's there myself.
But it's obviously visible to anyone thinking of overtaking me and I reckon it's doing what I intended it to do (acting as a deterrent).