Like anything else, for some people they are better and for some they aren't.
I have noticed difference though:
At Dominican salons, they only blowdry the hair after it is dry which is much, much more healthier for the hair. They don't do much styling if any and the way they blowdry the hair seems to be of a different technique than other salons I have been to. Also, a rollerset is almost automatic after they wash your hair.
I'd say the technique is different that the other salons I have been to (AA and other). In the other salons (non-Dominican) after washing your hair, they towel dry it and then start with the blowdrying which is damaging to the hair.