They’re like running on garden hose if you want an honest opinion. There are quite a few Crr tests to back that up too. The only selling point of the tubular version is that you can plug them if you get a puncture.
Tubular clincher appears to be trying to solve a problem that doesn’t exist. All the bother of tubs without the convenience of clinchers. I guess they pre-dated road tubeless so who knows what they were thinking.
Mike