Brad H.wrote a review of Schwalbe Pro One Tire - Tubeless on July 14, 2019
Familiarity: I've put it through the wringer
This was my first set of road tubeless tires, and I was perfectly satisfied with how they rode and how they held up over a season of riding. I think all road tubeless tires are more difficult to mount than tubed tires, and putting in a tube in the event of a blowout is pretty challenging, but it can be done. I'm now riding Continental GP5000s, and there's no way I'd be able to put in a tube in the middle of a ride with those.
The Schwalbes roll fast and smooth. I'm regretting that I replaced these with Contis now. The only reason I had to replace the Schwalbes is that I had a gash in the tread that was too big for the sealant to fill. I rode over 1 full year on them so I wasn't too disappointed when I had to buy a new set. The rear wheel was starting to box anyway. The tires held air pretty well. I usually inflated them to 70-80 psi, and after a week or so, they'd be down to 60ish psi. I have to inflate the Conti GP5000s before every ride because they lose over 20psi between rides.