I have very curly hair and am using the hair dryer as a diffuser.  The unit is VERY heavy and bulky compared to other hair dryers making it tough for me to use and manipulate.  In addition, the grip is really big and hard to hold, not at all. ergonomically correct.  
The heat is good, there are good settings, it does the job well but unless you are really strong and have huge hands, I wouldn't get this.