I bought these for when I go jogging but I have also ended up using them at work too. They are very comfortable and once they are in you can hardly feel them, I was using the inner earphones with earbuds but after a couple of hours they begin hurting my ears so I thought I'd try these. I can wear them all day they are so comfortable although the longest I've worn them for is 10 hours at work :)
They won't fall out and the sound quality and volume is excellent and for just 10 of your english pounds they really are a bargain and they're Sony! They're so good I'm actually going to buy another pair as I tend to lose or break earphones eventually :O
I use these in the gym, the sound quality is excellent, very comfortable to wear and they have coped with walking, cycling and weight lifting. Ordering another pair in case I lose them, can't do without them.
My experience with these hasn't been so good. I always leave it for 6 months to see how they're going, and these basically aren't. The rubber ear hook snapped within the first couple of months, and I am relatively careful with my headphones. Now the left phone is very quiet and I suspect won't be playing for much longer. I wouldn't recommend them myself, but read the rest of the comments and take my review on balance.
Had these headphones less than 4 hours and they developed a fault, one stopped giving sound. Absolutely horrible fit in the ear very uncomfortable, they are just too big for normal ears. After this absolute disgrace of a product I will never touch any of Sony's products, just awful. I have never bought any which has lasted for less than 4 hours. Buy these headphones at your own peril. To top it all off the sound is terrible you can barely hear your music extremely quiet.
Stay way clear of these headphones