I have been having such a hard time trying to find a decent pair of in ear headphones since the ones I bought eventually died. These were a pair of JVC ones I bought in Australia and they did just the job but I couldn't find a replacement pair so the hunt began. I have done quite a bit of travelling so will use my headphones extensively, sitting on long bus journeys, flights, the commute to work and then just walking the dog, so I like to think I have tested them for comfort (had some headphones in for about 6 hours without taking them out), ease to travel with, and general quality.
I first bought a pair of the Sennheiser CX300's in anticipation of a trip to Indonesia and I was quite disappointed that I had spent £30 because there was so much treble and not much bass, I mean they were good but for £30 I thought they were quite overpriced. So I sent those back and thought I'd spend the cash to get some good ones and bought a pair of the Shure E2C headphones thinking that its a good brand and they wouldn't let me down, wrong. They are so uncomfortable if you leave them in for longer than an hour, your ears go numb because they have to go around the back of your ear and its just not nice, the sound quality was average, about the same as the Sennheiser's, but these were £20 more.
So, disappointed with those I bought the Sony MDR-EX71SL things when I got back, and finally I thought I had cracked it, the quality was very good, it was a good brand and they were only about £18, but sadly I lost those in Portugal. So I was back to square one thinking I should just buy a pair of the Sony's again but someone had advised me to buy some skullcandy headphones because they're brilliant and really cheap so I thought for £9 why not and I am just blown away with the quality, they look really good, the bass is fantastic, treble is just fine and they are really comfortable, also the in line volume is really handy if you don't want to delve into pockets or bags to turn it down. You know when you press in ear headphones right into your ear with your fingers you get the best quality sound but then 10 seconds later they work their way out and you lose it, these have got the best fit you have that quality all the time, they are far better than any of the headphones I've tried and they're also the cheapest, I would recommend these outright, don't bother with the expensive ones.