I bought these to replace a down pillow of mine that had started clumping after a year or two of use.  These arrived, as some noted, folded over and compressed.  This is totally fine; I appreciate the material saved in shipping this way and it only took a day for them to fluff out properly (as also noted).  However, once expanded and fluffed, the nice airy fluffiness lasted less than a week.  Clumping followed.  If I don't fluff these every single night, they get just as clumpy as my older pillow got after years of use.  They were inexpensive, so I can't get mad about it.  I'm just disappointed.  I wouldn't recommend and I wouldn't buy again.

Pros: Inexpensive
Cons: Clumpy