My sister moved (Primary though) - she loves it, however, as others have said, schools vary considerably. There's no way in the world she would apply to the first 2 she looked round - to do with the ethos of the school rather than the T&C, but equally, not all schools would match the fact she was UPS3.
What she LOVES is not having to jump through hoops and reinvent the curriculum all over again every time an education minister coughs - that has GOT to be the main bonus.
Little things she can't get her head round, even now, 3 yrs in, seem tiny, and insignificant and not worth changing jobs for, but she said really make a difference to your working conditions are things like not paying into the tea fund, and having real coffee, and someone else who loads the dishwasher! The fact you are invited to a meal at Christmas, which is arranged and paid for by the school. I know, they seem ridiculous, but she says it's about how you are treated as a whole that is so different from any of the 3 schools she's worked in over the previous 19 yrs, in the state sector.
Smaller classes help (her's isn't ridiculously small, but 22 is a much better number than 30). She reports that as the dc get older there are longer days for the staff - supervising prep etc., but in their school they have coaches in to do most of the sports offered.
I think the key thing is that they are all different - you'd really have to go and look, and talk to staff at the school you want to go to.