fly-by-wire manual focus: good or bad?

At first: its name is focus-by-wire

I owned a Sony compact and many Olympus lenses with focus-by-wire formerly. I never used them for portraits or action shots in manual focus mode. But I have taken a lot of macro photos, and I absolutely loved this solution. You can adjust the focus by your little finger even on a monster lens.

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last photo report:
http://photo.nagykrisztian.com/events/airshow2012uk/main.php

the browser based optical simulation tool
http://nagykrisztian.com/synthrays/