Really excellent for travel, as they're quite comfortable and have excellent noise cancellation for the price. My one complaint is that the cable is a bit short, and makes a good deal of noise. Furthermore, the rubbery plastic coating makes awful tangles in your pocket. Otherwise a fantastic IEM, especially considering the $50 price tag on Amazon right now.

The thing I like most about these is how comfortable they are. They have a slight tendency to slide forward off your face, but you just have to get used to wearing them a little bit further back than usual.
 
These are the first pair that I have owned with a soundstage. I kept reading people talking about how good headphones would place instruments for you. Because my main pair right now is a pair of ATH-M30s, I never got to hear such a thing. What a difference!
 
My one complaint is the bright sound. They have less bass than my M30s, but a very pronounced treble, so much so that I would be scared to listen to them at full volume (Powered by my iPod) Unlike my M30s. Once my M50s arrive, I'll be able to write a better review.