JON, yeah perhaps until it starts to deform which took barely any time. It then made closing the clamp more effort until it gave up the ghost completely.
The Hope replacement I got (which was only a couple of quid more) has a brass bush that should last for years, the qr works really well and it looks good.
The particularly annoying thing about the On One qr was that it appeared identical to loads of ones on CRC that were almost half the price but had plastic bushes. The On One qr had a photo of it with a brass bush and the only review on the site mentioned it using a brass bush, which is why I was happy to spend more on it.
They have since added a note to the webpage explaining that the larger clamp gets brass but the small one gets plastic.