I ride 50-75 miles a week. I have never had a problem with Conti's. I should have looked for a shorter Presta valve as the 60mm tends to be a bit out of balance. But at 72 years of age and my skill level 18 mph on hilly roads I never notice the wheels being out of balance. If I was a real racer I'm sure it would make a difference.
Bought these for Back up tubes in case of a flat on my tubless set up for DK200 and fortunately didn't need to use them. I've run these before on gravel though without issues so thought they would be a great choice.
I like these tubes because I can keep just one size due to their versatility for my non-Road bike usage. I can use these with my commuter 700c x 32mm tires as well as with my 700c x 35mm-36mm GravelAdventure type tires. The 60mm Presta valve provides convenience when used with mildly aero rims where the 42mm valve length makes accessibility tight on some wheels.