X-E1/X-1 Pro with on-chip phase detection AF

Not yet. The 18-55mm lens has only just become available where I live.

However, what I read is a whole lot of people who are unhappy with the low-light focussing and a smaller number who think it is OK. What am I to make of this?

I doubt that those who complain about a failure to lock focus are imagining it, so I think that the most likely explanation for some people being relatively happy is that they haven't done a lot of shooting in the circumstances in which the autofocus has problems. Of course, if that is going to be a continuing pattern, then for those people the autofocus will continue to be OK.

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john carson