Have done a fair few miles on both, probably 2500 on the original One’s and over maybe 800 on the new Pro One’s now, always tubeless.
Was very happy with the old One’s, despite their weight. The new Pro One’s are lighter, marginally faster rolling, but don’t seem quite as tough. They’re more of a race tyre than the One, which many people argued was too heavy to be taken seriously given its price point. I’ve noticed the Pro One’s do seem to cut up more, put it that way, though they are lovely to ride on especially as they’re more supple than the original One.
For anyone looking for Pro One’s, speak to your local Schwalbe stockist. I’ve had them in my shop for a couple of months at least now. I’m lucky enough that I got sent a handful of pre-production samples to test as I sell a lot of Schwalbe tubeless road tyres, which I’m still using, but I’ve got both 23’s and 25’s in stock of the Pro One Tubeless tyres (email in profile if you’re after some asap) and 28’s on their way.