Tinstaafl.....I'm sorry,but I must disagree with you on this issue.
When upgrading to a faster machine, the pilot should be taught from day one to respect the speed of his/her new equipment and to be "ahead" of the aircraft.Under no circumstances should you let the aircraft dictate to you.If this means that for the first 3 or 4 circuits you have to "go-around" then why not? surely you will practice go-arounds anyway?and this will ensure that the new pilot thinks a lot more about what he/she is doing.
If they still can't handle the speed of it, then straight away you will know that although they can fly it in cruise pretty well, they do need to practice circuits a lot more!
If they are learning to fly a new aircraft,to me it would indicate that they are wishing to fly this type from now on and should be taught the correct sequence right from the start!---Don't make allowances for the pilot---if they think that they are ready for a new toy, then make them prove that they are!