I had the Yurbuds Ironman series Non-Duro (rubber line) and this one. The only real difference is that duro is easier to untangle! As far as I can tell, the sound quality is the same. Nothing special, just average sound. However, I love the design (that's why I bought a second pair after the first one died) and they fit really well. You can pull them when inside and they won't fall out. As many others have mentioned, they aren't soundproofed so you can still hear a bit of what's going on around you unless you turn the music up really loud. I think this is a good buy for the money if you need headphones for workouts/running/cycling etc.
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