I just bought the same hair dryer. I'll be in England for 2 weeks this summer, so I needed one with the international switch.

I've only used it once, and can tell I'll need to get used to it. I'm considering buying another of the one I have currently, though, since its not an expensive unit either, and because I'm so used to it! (It's a Revlon dryer for about $17)

I have always diffused with the cool setting! I'll start out warm and on low, then I go up to high on cool. Warm and high are for when I'm in a hurry or my hair is particularly "wet" or "heavy" feeling. I love it! I'll never buy a hair dryer without a cool setting ever again!
2c/3a/3b, Fine/med, Dense, high porous, & normal elas.

Lo-poo - Renpure Keratin, SMR, Giovanni SaS
clarifying - mix Johnson's H2T with low poo
Co-wash - Suave Nats. clar. or coco.
RO - GVPCB, Ion Eff. Care, TN.
LI - SMR, Cure Care, or RO
Seal - MO or Jojoba
DT - + honey, ACV, & EVOO to SM masque & GVPCB
PT - Gelatin!, CNPF
Styling - FSG, AIF, BRHG, LALS/PS, GF curl spray gel, SM Souffle/Smoothie, LOOB
Oils - MO!, EVOO, jojoba, GSO, SM Elixer, EVCO, VO5 Hairdressing