I've had the V-Moda earbuds for some time, and have recently gotten the Yuin PK2 earbuds. First, for me, earbuds come in handy in certain situations. I use them alot at work where I need to have something without isolation that is light and comfortable. I'm impressed by both the V-Moda and the Yuin - they are quite different however. To put it in terms of IEMs I've used, the PK2 is like the Ety ER6i - very good mids and highs, a little lacking on the bass. I enjoy them for vocals, jazz, folk, and classical. The V-Modas are bass heavy, with the highs rolled off a bit. The V-Modas do much better on rock and hip-hop. Would be nice to have an earbud that combines the two sounds - maybe some day.