since last summer my hair went really $hitty due to ignorant hairdressers and my dumb ideas, on my experience only those product helped me aesthetically wise (health wise mostly you have to eat foods right for your hair, and for your health too of course, lots of water/green tea), so I just can't imagine what they would do on normal/healthy hair :0
I never dry my hair with driers or use flat irons, I just leave them to dry on their own with that non-washing-after sunsilk cream