I'm curious, too, as to what your concerns are .... as I just got one.
So far, I have been quite pleased with it and like NJQuilter, I am thinking my hair has a nicer feel to it overall. Being that I have only used it a few times, I'm not believing that it really has made a difference though. Only time will tell.
Perhaps someone with more knowledge on this will jump in here and enlighten us!