Hmm...
Took delivery of my new 'Sole' insoles, the Active Thick (3.2mm padding).
The arch was pleasingly high and supportive, and the padding did indeed seem quite thick, very slightly thicker than the green Superfeet insoles I took out.
I had wanted to experiment with higher arches as my knees still tend to track inwards, towards my big toe or more, and deliberately walking on the outside of my feet (i.e. lifting the inside of my arches) seems to correct this.
Anyway, foolishly fitted insoles and immediately went on a 10 hour hike over 7 Munros
Initially my feet were a bit uncomfortable, a general muscular ache all over, which I guess is to be expected as they adjust to a new shape/position. This seemed to ease over the day and on the next day's hike was gone.
However I noticed my toenails seemed to be taking a battering, either the thicker padding was just enough to bring them into contact with the top of the boot, or the insole was somehow pushing my foot forward a bit.
Finally, I also noticed I developed very raw, almost blistered heels on the second day. I doubt this is specifically to do with the insole but maybe to do with a 'soft' bit of my heel now being brought into contact with the back of the boot.
Oh, and my knees if anything seemed slightly worse, so not a great result all round.
If nothing else, treat new insoles like new boots, don't try and smash out a big day with new insoles unless they're exactly the same as your old ones!
Disclaimers: I was using new laces which didn't seem to grip as well as the old ones, so perhaps the blisters and the banged toes were actually just down to my foot moving more in the boot.
Also, I had some angled wedges under my heels with my old insole, to help rotate the foot outward a little and promote better knew tracking. A podiatrist I spoke to was quite dismissive of them so I didn't bother fitting them this time, will put them in and see what difference it makes.