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I have one on my 925 as well and it is beautifully smooth. It still shows just sniff of image shift. I think the reduction is because you can move the focus much more slowly so the friction on the system (the grease ironically enough) is less of an issue.
No focus lock involved but it does not seem inclined to move. Fitment was really easy, 5 minutes territory.
My only gripe is that it seems that you can induce image shift by pushing sideways on the FT assembly, but I never did do the same test on the original focus knob. Not a big issue.
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