I have a pair of yurbuds and I actually really like them. The problem is that they sound like absolute crap, but I find that the eartips that they hype up are really as good as they say they are.
They are extremely secure, I can shake my head violently and they won't come out. They're very comfortable, and the best part for me is that they don't isolate at all. I've been looking for some earbuds like these for a while, because I really dislike walking without being able to hear my surroundings. The other bad part is that I think the eartips degrade the sound quality somewhat. I tried the tips out on some hisound live earbuds, and while they fit on perfectly, they sound strange with the yurbud tips.