My first experience was brilliant...when DS was in Y4 he was in a very, um "lively" class, but teachers were full of enthusiasm, and never seems to get worn out.
The following year, DS2 had two teachers, neither of whom seemed to really know him, at parents evening couldn't remember if he was on school action, and were unable to write his IEP, as they just didn't know him. (Luckily I was quite capable of writing his IEP) - Overall very disappointing.
DD then had two teachers in reception, both brilliant, both able to cover when the other was off, so never any need for a supply teacher, which was brilliant.
This year DS2 has had a job share. He liked one teacher (3.5 days), and worked really hard for her, disliked the other (1.5 days(, and did nothing for her. In a way I was annoyed he had to have the one he didn't like for the 1.5 days, but I guess he could have had her all week, and the whole year would have been a disaster.
Overall, I would be quite happy for my DC to have two teachers again. (And I am quite precious about these things!)