^^x2!! I actually stumbled on these at Best Buy a few months back and I thought, whatever, just some new fashion craze. They are probably junk. I have tried in ears and earbuds but neither of them could hold up through the sweat of a muggy morning run. They fall out eventually. The in ears would make it about a mile to a mile and a half and then that was all she wrote. I tried the other sony over the head workout headphones. They work just fine but really are of the poorest quality sound I have ever heard.
So then last year I ended up killing my px100. They worked great. Stayed in place, but aren't meant to hold up to the constant sweat. I have been using Sony clip ons for about 6 or 7 months. They actually work quite well and have not died yet, but the pads are seriously turning to mush.
So about 2 weeks ago I saw the Yurbuds ironman series in Best Buy again and I took the plunge. They are absolutely fantastic!! I am sold hook line and sinker. I run 4 to 5 times a week and for the last 2 weeks i have had them in. They haven't budged even the tiniest bit. In fact, the other morning I ran 5 miles and about the last 2 miles it was misting and raining back and forth. My head may as well have been under the shower. They still didn't budget at all.
They give you 2 sizes in the box. Neither really gives me an exact fit. So this morning I finally decided to order the customs. You just take a picture of an ipod earbud in your ear or hold a quarter up to your ear and upload it to their site and then they find the exact size for you. Now they already have 10 different sizes, so I don't think they are actually custom molding to your ear, but probably just matching your pic with the size that's going to work best. The small ones I use are a tad too small, but I still have had absolutely no issues with them.
The sound is far better than I thought it would be. Pretty big bass considering it's an earbud. And I am not sure how this works because they are ear canal earbuds, but you can hear everything as if they aren't even in your ear at all. Quite a cool thing.
Also, be aware they are VERY loud. I had to lower my volume by 3 over my sony clip ons. I might write up a full review on these soon. I'm really pretty impressed.