Fitted these to a pair of ENVE G23 rims. They slipped on without tools or swearing, but I was surprised that they inflated to 38mm on these rims most tires end up wider than specified - not narrower. Still running them with inner tubes, so can't comment on tubeless setup issues.
I've been riding on this setup on muddy but reasonably firm gravel. Despite the shallower tread (to get that extra speed), the grip has been surprisingly good, even up the steep slopes of one of our local cyclocross courses.
Have these on my Boone on an Aeolus Pro 3 TLR wheelset. Mounting was pretty straightforward, I used Orange Endurance sealant. I had a slow leak in my front tire, but after a few rides the leak stopped. Ridden at 50psi, these are great on a well traveled dirt road, an old dirt and gravel road without smooth tracks or on pavement. I rode up a local mountain (in the Berkshires) after a rainstorm, so the dirt turned to mud but I didn't experience wheel slip or get stuck. I got the 35mm version, and thought initially I should have gone with the 40, but these have been fast, grippy, and great.