I have noticed that the hot-air-brush has a cool tip which is warm but not going to burn immediately like a flat or curling iron plate. This feature is a huge plus for younger users.
I found that the comb is warm but not burning to the touch, even on the highest setting, which is great for younger users.
I noticed that the hot-air-brush heats up quickly and gets super hot. It only took a couple of passes in each section to straighten his unruly hair.