Review (4/5): works like it's supposed to
I have fine, curly hair, and use a Conair dryer with attached diffuser every day at home. I purchased this collapsible diffuser to use exclusively with my travel blow dryer (https://smile.amazon.com/dp/B00006IV22/ref=cm_cr_ryp_prd_ttl_sol_2?th=1) when traveling, and have used it a few times now. Overall, it works like it's supposed to and takes up a lot less space compared to my every-day diffuser. Some other reviewers commented about the tight fit when putting the diffuser on. I also had a hard time with this, but once it was on there wasn't a problem. Other commenters also mentioned the diffuser collapsing. I didn't have a problem with this, but I tend to hold the diffuser and not the dryer while I'm drying my hair. However, it isn't sturdy enough to lift my hair at the roots like my every-day, non-collapsible diffuser is. Pros: compact design (collapses to about an inch); light; easy to remove from dryer and collapse; diffuses the air like it's supposed to.
Cons: a little hard to fit over the dryer nozzle; not as sturdy compared to non-collapsible diffusers; not strong enough to lift the hair at the roots for drying.