All the time. The sound quality on my Samsung Mesmerize is much better than the quality was on my iPod Touch. Add to that the extra quality that the power amp app adds, and I'm very satisfied.
Honestly, I have never been able to get a pair of wired headphones to last more than a month or two at work. I've got a pair right now that I've had for quite a while, but I don't use them very often because I bought a pair of bluetooth headphones a while ago. Sure, the sound quality isn't as good as wired, but spending $50 once is much better than spending $20 every time one side dies.