I have RBCCs, haven't been especially impressed by them. Grip and durability feel middling to me (prev experience with GP4000s, 4 Seasons, Michelin Pro4 Endurance). Comfort and speed are good but that's probably more down to tubeless and new wheels.
I've ridden gp 4000 / seasons loads in the past but not the Michelin's; I liked pro ones but they're too soft for doing many miles. Just didn't want to go to the X-guards and find them feeling too slow v. Pro ones. Tough choices
The X guard tyre shows similar rolling resistance to the 4 seasons tyre at the same pressure so no slower in the test I had done. The difference I never got a 4 seasons past 1000 miles before I killed it somehow.
I have RBCCs, haven't been especially impressed by them. Grip and durability feel middling to me (prev experience with GP4000s, 4 Seasons, Michelin Pro4 Endurance). Comfort and speed are good but that's probably more down to tubeless and new wheels.