My favourite touring tyres!
You say they are not immune to flats but on my first long tour through East and Southern Africa and over 6,000km I did not get a single puncture - even on dirt roads with lots of thorns. That made me a lifelong fan. I lost track of how many kilometres that pair did before they eventually started crumbling.
A while ago some people on this Forum thought I was being extra by going out of my way to try and get a replacement set while I was touring in South America. But once I got those new tyres on I again had no worries about punctures. (The only one I got was probably from some lout sticking a pin or blade through one of my sidewalls).
They may be heavy but for the peace of mind I would choose them any day. One other thing: I think being very diligent about maintaining the right tyre pressure makes a big difference: if you let pressure drop too low it reduces how puncture proof they are.