Luton was about 50% done a month ago with my first trip through one of the new scanners being taken
From my point of view, it was a real levelling of the playing field experience as being blind and having had one's white stick removed for security scanning which is just the most preposterous thing ever. But I can understand it. I was rarely if ever able to walk through the arch in a straight line so had a much much higher than average proportion of pat downs and indeed some security operators at some airports offered me the option of just going straight for that option rather than passing through the hoop
Now I just stand there and it's done with the minimal of fuss and bother. And as for being able to take liquids of regular size again, I am so happy. It's really rather sad
There are apparently now a couple at Edinburgh but suspect they are probably reserved for fast track or business or whatever customers
Once everywhere has gone live, I can see the amount of time required for security across the airport network. Reducing to levels experienced in the mid-2000s which as a fairly frequent flyer, is a good news story