I was surprised by what I read in this thread. I'm a 4a/b texlaxed head with loads of natural looking texture..I'm at BSL and growing toward MBL.
I am super careful with my hair, but it would snap off in a second if I used that comb looking blow dryer. I bought one JUST like it before and I know from experience.
I used to use the comb attachment on the blow dryer...snap city!
Now I use the Tension Method that I learned on this board. I start at the top of my head, section, detangle, heat protect and then blow dry on low heat from roots to ends.
At the end my hair looks like a lion's mane.
Then I start in the back and flat iron slowly, section by section. I usually end up with thick, long, shaky hair (Minimal Breakage).
I have given up the flat iron and blow dryer currently and I'm five+ weeks without heat. I've been wearing twist outs and buns, loving the look.
Since almost everyone had a different experience to share with blow drying...I would suggest that any newbie...be very careful, watch out for breakage, use a heat protectant, start on the lowest setting (or don't blow dry at all - air dry!).
I think Blow Drying and Flat Ironing are two of the most damaging things that I do to my hair. So...I stopped.