I received 5 Continental tires, (2) 29x2.3's and (3) 29x2.6's that were all the same model (Ruban Shieldwall). All 3 29x2.6's had really bad casing wobbles, way beyond the slight wobble that 95% of tires, even Rene Herse tires have. These are the Shieldwall tires that were made in Continental's China factory- never had an issue with the German made Conti's. (Bike mechanic for 45 years, built dozens of wheels, mounted hundreds of tires- yes I can properly seat a tire, and spot a bad tire.) The first tire was replaced promptly, no questions asked. I hope that I can get the others refunded or replaced, also. That said, the tires, while heavy for their size, have plenty of grip in the dirt, and are really, really quiet on the pavement, which is what I got them for- a true allrounder tire. I plan on setting up tubeless, but haven't done it yet, so I can't comment on that.
I've ordered many other tires from this company in the past with prompt delivery and no issues.
Smooth ride with MTB tires on pavement, hardpack. Haven't tried sand or mud, but I don't ride a lot of that stuff. Haven't tried high speed cornering yet, but should be OK with aggressive side lugs. Haven't tried real technical stuff. They are nice tires for what I normally ride.