They are the tough version. I really like them. Very easy to setup tubeless, roll fast on tarmac and have good grip on loose surface.
I've tried GK SK and they are ok but have not ridden them for as long as the Terrene and also are 700x43 so not really a true like for like comparison.
Light or Tough? How do you rate them, comparing to, say GK SK if you had them?