'Old school' v 'new school' dog training methods

In the shortish time I've had Uly, I've come across a number of Gun Dog trainers through the clubs I've been to. There seems to be many ways to train your dog, but always, of course, with similar aims. In the past I understand that methods have been extremely firm. I've heard that some Gun Dogs have become traumatised by their training and consequently never make the grade. 

Fortunately, I've never witnessed any really harsh handling. However, training methods vary considerably and I can honestly say I have learnt things from every trainer I've come across.

The 'new school' methods practised by the two trainers I admire most seem to be based on a deep understanding of canine psychology and produce excellent results. Importantly, the training must match the age of the dog and the stage it's at. It can be really counter-productive, to try and teach a dog things it isn't ready to learn.

First and foremost, I've been trying to work on the basics of: Sit, Come, Wait, Heel. Get these right and I'll have an obedient dog.