Almost IMPOSSIBLE to put on, and collapses far too easily.
Overall, it's not terrible, but it took me forty five minutes (and two broken fingernails) to get the thing onto my completely standard-sized dryer.  Also, whenever I use it, I find that it collapses down with the slightest touch against my scalp,  which gets annoying when you have a large amount of hair that takes a long time to diffuse.
Rating: 3 stars