I put the DH one in a Bullit and it was fine for about 18 months until I changed frames and it became surplus to requirements. When I took it out it literally dropped out, though it hadn’t been loose in use – frame or headset issue, not sure.
I had no issues with it, it was well ridden including a lot of trail riding in the Peaks etc, didn’t require a re-grease or new bearings, or tightening. There was a bit of surface corrosion when it came out, but nothing serious – the design depends on it being made of steel though.
2Pure sent me a second headset race FOC when I asked if I could buy one and I had no problems with regularly swapping forks about.
£20? Worth it based on my experience.