Review (4/5): I did NOT get this diffuser for free and I like it as well.
I did NOT get this product free. I paid for it. I tried a few universal diffusers and think this one is pretty good. It would've been excellent if the prongs would not stick out at all out of the edges (they do less so than most universal diffusers but I prefer them all the way in to create perfect curls). It did a good job overall and I was satisfied with results and am keeping it.
Besides doing a good job on my curls, it's lightweight, obviously very portable and does fit my blowdryer nicely.