I spent an extra $100 on a dryer because this diffuser didn’t fit on the twin turbo 3800 and I have clients who still like to use a diffuser on their hair. This diffuser falls off of the twin turbo 3900 constantly. And it’s too big to hold on with one hand while you’re styling the hair with the other. I hate it. So not only am I stuck with a diffuser I hate, I’m out $100. (The 3900 is great, though!)
Excellent. No problems.