I have 3 children and each of them have had years with job sharing teachers and years with just one class teacher. Having read many education threads on MN over the years, I know how hard it is for teachers with young children to juggle the needs of their own children with the needs of the children they teach and so a lot will opt for part time. But having just looked back at my children's time in primary school to date, I've realised that without exception, their "duffest" years have been those years when they've been taught by job sharers.
I'm now wondering whether part-timers would be better suited to secondary schools where pupils are used to moving around and having a number of different teachers anyway; certainly I had two different teachers each year for English, for example, and it didn't present any problems AFAI can remember. Communication is much harder with job-sharing teachers and IME consistency between job sharers seems to be an issue too.
I'd love it if we could have a good discussion about this and have therefore deliberately not posted in AIBU! But I'd be interested whether others have found this too (posting this thread was prompted by reading Greeny's current thread about trying to deal with two job-sharing teachers) or whether we've just been very unlucky.