Hmmm, the performance element to Manchester is a bit of a myth in my opinion. Yes there is a lot of performance, but it is all extra curricular. You have to be in choir or orchestra, but it doesn't count towards your degree programme, and you have to do 20 credits of performance in your first year (but you can opt out if you ask really nicely!).
The staff at Manchester are a mixed bag. Kevin Malone is probably the most inspiring lecturer/seminar tutor you will ever have. He's a postmodernist composer so he is open to all ideas. Other composition staff can be a bit snooty. Phil Grange is fond of hard love and can be quite rude and harsh, but I suppose it works. Whalley seems constantly nervous. Reeves is a bit arrogant, but then again so are most composers. Casken is really really nice and friendly and witty, but you don't see him around much.
The academic lecturers are very very bright and very good lecturers. Cooper is just the God of Beethoven, Herissone is so intelligent and hard working its insane. Fallows is so much fun.
Basically all the staff are very approachable even if some are morseo than others. There is no one I dislike on staff, and I usually dislike someone! :P