Review (3/5): and feels like it might slip off
It came right on time, with Prime 2-day shipping. But it came in a plastic baggie with the Curly Co logo on it. No product box, no instructions. Granted, I could be the only nerd out there who needs instructions on how to attach and use a diffuser. It was mostly the attaching that I needed help with. It was very difficult to attach to my blowdryer (a travel size Revlon, I think? I'm not sure, I originally bought it for helping my watercolor dry faster), and feels like it might slip off.
To attach, I ended up putting the diffuser on the floor, pressing the barrel of my blowdryer into the attachment tube, and sort of peeling the attachment onto the dryer. My fingers got pinched and scraped in the process, and I pretty much had to put my full bodyweight into it. If my partner had been home, I would have asked him to do it since he used to throw people for fun (cheerleader) and would have had the required strength in one arm. Even so, it took me a solid 5 minutes of bodyweight and a few minutes of Googling to figure out if maybe the diffuser just wouldn't work with my dryer, or if I was doing it wrong.
I haven't used the diffuser yet. It just got here 10 minutes ago. I'll update when I've used it a few times.
**EDIT** I've now used this diffuser twice. It stays on well enough while I'm using it, but as someone else mentioned: collapsible means holding the diffuser the whole time anyway, because it keeps collapsing during use. Also, be prepared to go through the painful process of reattaching it EVERY time you want to use it. When I lay my dryer down when I'm done, at least 1/3 of the edge of the diffuser slips off the barrel every time. And although I no longer need to use my bodyweight and I've tried other ways of attaching the diffuser, the only one that works is getting my fingers in the silicone attachment ring of the diffuser and stretching it over my dryer. Doesn't sound like a big deal, but this material doesn't stretch well-- as a result, my index fingers and thumbs are visibly scraped, and one index nail got smashed between diffuser and dryer hard enough that one side of the nail is detached and bleeding. A+ job making this "universal" diffuser attachable by the women it's meant for, dev team!