It's pretty simple to attach to your hair dryer (as long as your dryer is one that fits). I have a pretty average brand (Revlon) dryer with a tapered circular opening and it slips onto it just fine.

I wouldn't recommend this for travelling however, unless you don't mind the amount of space it will take up in your toiletries bag.

I'm very happy with this diffuser. It fits very well and I like how you can adjust the amount of air flow!

This diffuser is a huge step above any attachments that have ever come with my blow-dryers! The rubber attachment piece fits perfectly onto my Conair, no slipping off or repositioning necessary. I'm not sure the air flow control feature really makes much difference. It seemed about the same to me in all positions. This is a very high quality diffuser though, I'm impressed!

Keeps my curls curly with less damage plus my hair doesnt stick to it.