I say go for it. Personally I think it's really cute! But, as others have said...if people stare, no worries. What are the chances of ever seeing any of them again!?!
As a matter of fact, I think I might look into ordering one for myself and my daughter. We both have very curly, frizzy hair - mine is much kinkier than hers, but we both spend a lot of time each day getting our hair straight. My daughter has mandatory swimming classes at her high school and they don't allow time to dry hair, so she was just asking me the other day if this type of product is sold. She wanted something "different", not a traditional swim cap. She's going to be so excited when I show her your link.