On the go? Yes absolutely. That is, if you're going to go somewhere and then sit down in a hotel room or something.
These headphones are pretty cumbersome for use in a subway or on a plane unless you get about a straight 3.5' or so cable with a 3.5mm head and a 2.5 mm head. The stock wire, and the optional straight cable are both too long to take portable and anywhere you're in a public space with a lot of movement, you're going to run the risk of it snagging on this or that or him or her. If you're looking for an out-and-about headphone, I'd check out the Skullcandy Aviators. They look cool and they sound pretty good and they have remote iPod controls (if you have an iPod/Phone.) [note, I recommend these because they're the only other headphone that folds that I have any decent amount of experience with.]
If it's the former, though, I definitely recommend the SRH440.
Edited by phamkl - 2/22/12 at 6:10pm