First off, please disregard J. Ulan's review. This is a fine example of what happens when you don't DO YOUR RESEARCH. THESE HEADPHONES ARE NOT COMPATIBLE WITH ALL IPODS/IPHONES!!!!!
COMPATIBLE MODELS: iPhone4, iPhone 3Gs, iPod touch 2nd -4th Generation, Ipod Classic 120gb & 160gb (2009), iPod nano 4th-6th generations, iPod shuffle 3rd-4th generations, & the iPad.
Now that I got that out of the way, on to my review. Mind you, I just got these headphones so this is based off my first impressions. A little background about myself: I never liked the Apple supplied headphones ear pieces, so what i'd do is make my own. I would remove the speakers off the Apple one's and soldered the HAFX34B marshmallows to them. Fairly simple, but took a little patience and time to make sure I didn't break the covers. Overall cost was around what these HAFR50's cost. I made a few of these headphones and kept them in my pocket all the time to use with my iPhone.
I decided to give these a try since they're already made and perhaps could be superior to the Apple ones. The HAFR50's remote and mic is the same length as Apple's, but slightly thicker. The Marshmallow's remote is a lot smoother and has a wider range of motion making controlling the iPod function's 2 and 3 clicks easier, in my opinion. .For those that haven't used marshmallows, the foam earpiece comes in 2 sizes which is included. They act like ear plugs and will keep a lot of the noise from outside out. I once bought a pair of expensive sound isolating headphones and preferred the marshmallows over them since they worked so well. Overall, I'd definitely recommend them especially in this price range. The sound is on par with what you'd expect for headphones costing $30.
The true test is how long they will last. I plan to come back in a few months to give an update.
UPDATE: 2/25/11 - Been using these heaphones for a while and keeping them in my pocket. They have held up really well and show little to no sign of wear. I'm very happy with them and would not hesitate to buy another pair.
UPDATE: 4/15/12 - Just an FYI, Apple added the feature which would allow you to hit the volume up button to take pictures. Because of this function, you can also use the volume up on your headphones to take a steady picture or even a self-portrait from a distance.