I'm not sure that 20 minutes in a Tutor with a pilot (who might never have been a QFI) is going to appeal quite as much as being taught to fly to solo standard in a Viking?
Certainly an Air Cadet instructor colleague of mine reckons that hanging around all day for a short AEF flight doesn't have anything like the appeal to his cadets as Vigilant flying once did. As for the part task trainers, he reckons that they're worse than useless and cause a degree of negative training.
Is that the generally-held view amongst those who instruct Air Cadets these days?