These are definitely the best tires I've ever used on my gravel bike. In 40mm size, they are extremely easy to mount tubeless with a JoeBlow pump. No struggle, no fighting, they seat immediately. The traction on mixed surfaces is incredible. I've taken them on wet single track where no gravel bike has any business being, and they gripped like a mountain bike tire. On packed dirt and gravel they are very cushy and smooth. Conti has another winner with the Terra Trail.
I've put about 250 miles on these tires, about a 50/50 mix of paved roads and gravel, and they have performed great. They roll easy on the pavement, grip sufficiently in the dirt, and have held pressure set up tubeless. I haven't had them in wet or muddy conditions yet, so no comment there. I would highly recommend at this point!