Final report on a 140/80 Karoo 3 on my 950Adv. After 2200 miles it looks like this-
I thought about squeezing one more 300 mile ride in with it, but you can see the carcass is starting to touch in between the knobs.
I did a lot of dirt road drifting with it, and it had a similar lifespan to a TKC80 under the same riding conditions.
Not sure I will buy another one.