Hi, all. Well, along went and saw 4 teachers (and met some parents from DS's primary who ruefully recounted how their DC had, in one case, triple booked 3 teachers!! Glad we kept it at 4).
It was well run, and ahead of time, But that's probably because the teachers were given 10 minutes per appointment to say.
"Hi, Mr & Mrs Ampere, hi Ampere Junior 1, and doesn't Ampere Junior 2 look just like his brother?! Anyway, AJ1 is doing well in class (tick). He's turning in a good standard of work (tick). He likes to contribute in smaller groups but is a bit reluctant to speak to the whole class (tick). I won't be grading him in the progress report you'll get in 3 weeks time as I think it's too early to judge given the relatively small amount of markable work they've turned in so far (tick)." 
None deviated except the Science teacher, a wild Irishman who said DS1 (aka AJ1!) understood graphing concepts well, and the English teacher who said he'd turned in an excellent piece of written homework (Yes, I know, I helped him structure it and have read his logbook where you said that!).
I know I am sounding peevish- I'm not really. I am glad the evening was well run and DS hadn't double booked us. I'm glad the opportunity exists to meet the teachers if you feel the need. It was interesting to eyeball his teachers though he is 'losing' 2 next week (bit of streaming) and one had only had him for 3 weeks.
But I still believe that a 10 minute chat with his form tutor (whom we weren't 'allowed' to meet unless as a subject teacher!) would have been more useful! We get another parents eve in the summer which will be far more edifying, I believe, and we will be meeting all his teachers then.