Haven't been through the programme but had a SCITT student last autumn and have tutored for local SCITT. Based on what I've read online, it's a bit like the wild west - some SCITTs seem excellent in terms of organisation and support (both for student teachers and schools) and some seem like they couldn't organise their way out of a paper bag. How you tell what your SCITT will be like before you start, I have no idea.
Personally, I am deeply, deeply dubious about them. Too much depends on the teacher you are placed with in school as to whether you have a good experience or not. My local SCITT gives students two half days on teaching Maths - how can that ever be enough? They are reliant on students being taught subject knowledge and pedagogy in school, which in turn is very much dependent on who your class teacher is.
I lost pretty much all of my PPA/non-contact time in the autumn term to support my student. OK - I gained when she was teaching, but as I had to be in the room there was a limit to what I could do with the time. I then had to spend huge amounts of time verifying evidence and writing an end of placement report (my mood wasn't helped by the student not having all her evidence uploaded in time for me to verify it, despite me having told her when I'd be doing it, so I then had to go back on a second Saturday and do the job all over again when she'd finally got her act together).
But for me, the icing on the cake was that my student had paid £9K for the course (and gave the distinct impression that she felt it was my responsibility to make sure she passed the placement, as she'd paid so much). My school got £238 for all my work over the term. I, obviously, got absolutely nothing. For that, I was expected to be out of the classroom on compulsory training and meetings with the SCITT something like 3 days in total, in addition to the weekly meetings, lesson observations, feedback meetings etc etc etc.
I don't doubt what my Head tells me, that at the end of the year the SCITT students are all good/outstanding teachers and really ready for whole class responsibility in September. My concern is the cost to the hosting schools and to the hosting teachers who kindly share their classes. I've told my Head I won't ever host a SCITT student again, nor will I tutor for them. That's a loss to the SCITT on both counts as I take a pride in doing a really good job in both roles. But I fail to see why I should put in so many hours for the SCITT to make a massive profit out of my efforts.
That's not what you asked, but I'm feeling better for having got it off my chest!!