I've bought 3 of them, but only because I keep accidentally yanking the wires. Let's face it, if you're rough on them, or any wired earbud, expect to replace them occasionally.
SOUND:
I'm a bit of an audiophile, so I like volume and clarity... for a $20 pair of earbuds, these things sound great. Crisp midranges and highs, with just enough bass to not make the sound "muddy".
BATTERY LIFE:
I use the earbuds at work, and most sets run out of battery after about 6 hours of playtime. I was skeptical of the 120 hour batter life claim, but once fully charged, I only have to charge them every week or two... and I use them a lot!!
CONCLUSION:
Buy them! Break them, replace them... for the money I haven't found better sound or battery life!!