Year 6 teacher here. Just my tuppence thrown in here, so obviously not trying to discredit or gratuitously contradict anyone's view!
SPAG - I thought was largely very predictable and reminiscent of all the practice papers we had done. No surprises and the kids seemed confident. Spelling was reasonable, with maybe 3/4 red herrings or tricky words. Largely seemed OK and the kids came out of it not seeming too perturbed!
Reading - Very interesting this year. I thought the distribution of reading skills across the paper was peculiar. I analysed the test as the kids were doing it and realised that inference made up a good chunk of the first text, despite them being a majority of 1-mark questions. This text was (in my view) the easiest of the three, in terms of lexical density and word-count, but I thought the questions were the hardest; this interplay made it challenging. The middle text had more of a mix of inference and retrieval, with a higher word count which meant that by the 40 minute mark some of them were looking like not finishing. The final text was very dense but the questions were mostly retrieval so oddly a lot of the kids found that text easier. I didn't think it was a particularly unfair paper, compared with the past papers (particularly the likes of 2023). What I would say, however, is that the DfE are clearly trying to save money by keeping word count high but printing smaller text over double-page spreads! This visual aspect of words condensed onto a page definitely didn't help those with neurodivergent conditions.
Maths - Arithmetic - predictable, formulaic, easy to prepare for. No surprises really.
Maths - Reasoning - Paper 2 - Some curveball questions, but largely OK. Some of the basic skills, however, were tested in a very oblique and round-about way which I actually thought was a bit unkind; I had some kids failing to get the full complement of marks on particular questions because they hadn't fully understood the question's form and structure. This isn't really all that fair when you have a solid sense that a child knows something (according to your teacher assessment).
I hope that's in some way helpful!