This Review Title is Fit is key... and the content is: This diffuser works fine if you have a hair dryer it fits, I have 3 hair dryers; it fit one of them - the Conair 1875, but not the 1875 Ion Shine.  The latter has plastic projections on either side of the blower opening which don't allow a fit.<br />The &#34;flexible&#34; opening of the diffuser does not really have any give, so it fits or doesn't..There are other information for this review, one is This reviewer did purchase it and the other is 3 people think this review is helpful.