I have ridden a lot of miles on 38mm Gravel Grinder Race tires with tubes. I like them a lot. Very fast, even on pavement, and grippy in the loose stuff. When they slide, they slide predictably. Excellent all-around tire. (For a couple years, I even held an 8-mile long Strava KOM on smooth paved roads -- taken on a Niner RLT9 with Challenge Gravel Grinder Race tires. My time is still 2nd-fastest.) I rode the DK200 on them at 50/55 psi, with tubes, and had zero flats.
I have heard, though, that the Gravel Grinder TLR is not as good as the tubed version. But I have no experience with it.