I didn’t even know they made these anymore… I ran a cyclocross version back in the early 2000s when Tufo was a popular choice and considered a high performance cx brand. Only issue with those was that I rolled a couple tires racing cx at very, very low pressure.
I can confirm the ride isn’t nearly as supple as most clinchers and not even in the same realm as a real race tubular like a Vittoria Corsa or Veloflex. Flip side is that they’re bomb proof because unlike a tubular there’s no latex tube. They’re basically tubeless. A butyl “tube” is bonded to the inside of the casing to hold air.
I actually picked up some used wheels with Hi Carbon 25 tubulars that were brand new this year. Same ride as my old Tufos but they’re just as durable as I remember. I ride with ~90psi on the road with a wide rim. Put some sealant in them and they’ll likely last a very long time for general riding. I’ll swap mine with Corsas next year but they’re race only wheels.