I have never said that I think that SATS for 6/7yo's are a good idea, and I can hardly be called up as it being an 'ego massage' when my DD (who is older than DS1) didn't do her Y2 SATS as she was working WELL below lvl 1 in Y2, in fact she didn't hit NC Lvl 1 until this year, now she is in Y7...and I'm seriously concerned about the fact that DS2 is going to be completely unable to produce any wrtitten work for it due to his SN, despite being 'average' in oral answers for his peer group...so I think 'ego massage' is a bit off base, considering I have 3 DC's, one at the very lowest end of the ability range, one who is slap bang in the middle of the ability range, and one who is at the top end of the ability range.
I strongly disagree with SATS for primary school children full stop, as in Y2, the difference in levels between the children in the class can range from p-scales at one end of the classes ability range to Lvl 3 in the SATS at the other. And Y6 SATS, really, just waste a year of their schooling where they are 'taught to the test', instead of getting a fully rounded curriculum.
My answer to the actual OP is that I would concentrate more on the teacher assessments, the class teacher is the person who has taught your DC for 5 hours a day, 5 days a week for by that point, the best part of a year.
And Bellisima - Why should I not be allowed to ask questions about whether or not the school is stretching my DS1 enough, just as much as I'm allowed to ask questions about whether the school is doing enough to help my SN DD or DS2? Am I not allowed to be just as proud of my DS1's academic abilities as I am of the fact that DD has learnt to tie her shoelaces at 11.10yo? I take pride in ALL my children's acheivements, every child has different strenghts and weaknesses, every child is different.