About the level of quality I would expect from a used (second hand) product. No more - no less.
It is fitted to vehicle and works OK - operating the power steering as it should.
The rotating drive wheel on the pump was slightly out of line, not noticeable until fitted and engine running. This is causing a small "wobble" when running. After 10 days there has been no issue with this. Therefore, fingers crossed, I hope it continues to operate effectively and does not cause any problems in the future.