I sent my Ultimate Ears 500vi back because they just couldn't stay in my ears long. The sound was excellent, but when they're not in your ears then it's hard to hear. I have tried all sizes of gel tips as well as foam tips. but none worked well for me. The big ones were too big and the small ones just fell out. Average size was the best but not enough. I was able to compare the UE 500vi to the next model, the 350vi, which suited me MUCH better and actually stayed in. I think the 500vi dropped out because they are too heavy. and too long. so they stick out too far and slip out. Instead of the snug, secure fit of the more compact, lighter 350vi. I also didn't like the 500vi's cable - because it's flat (as opposed to round) it feels very flimsy and flimsy at the connection points. It may be "obfuscation free" but I haven't seen any obfuscation on the 350vi either. The sound in 350vi is not that good. The bass is too strong for some songs. but otherwise I'm fine.
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