Good, but not blown away
This is a good product.  it actually fits my Sedu 4000i, which is a big plus.  Also love that it collapses to store.  I have thick curly hair (3A and 3B), and so i was excited to try this.  So far i am having two issues.  One, it tends to collapse to smaller size during use, esp when i get it closer to my head. Not sure that's a good thing.  Two, and this may be an issue of me not using it properly, it seems to make my hair too curly!  I like having the longer thicker big curls, rather than the tighter smaller and collier curls - and when i air dry, i usually have big thick curls.  But with this diffuser, i end up with smaller tighter curls, which is not exactly what i want.  As a result, my hair overall ends up looking another 2-3 inches shorter because the curls are tighter and smaller.  So if your hair is wavy and you want more curl definition, this might be great - but for me, going from curly to almost coils/kinky is not a plus.  But on the plus side, it does give me good volume at the top of my head and the crown.
Rating: 3 stars