Fine for travel, don't recommend for daily use
I bought this for a business trip because it's collapsible and my carry on space is limited. While it travels extremely well and does appear to fit over any hotel hair dryer, there is no mechanism that keeps it rigid after you unpack it, so it has a tendency to collapse on itself during use. I solved the problem by using one hand to hold the dryer and one to hold the diffuser in the open position. This is fine for a $12 travel diffuser but definitely annoying. My hair looked fine after use. Not as good as with my normal diffuser but better than an air dry.
Rating: 3 stars