So I thought I would try out some bluetooth earphones when running, because, you know, that meter of white cord from the iPhone to the ears is just unbelievably annoying (yeah, I know, 1st world problems).
They came with a bunch of different size rubber bits and after choosing the smallest set of rubbers they were very very snug. I mean _really_ snug - nothing was going to make these fall out. They also cancelled external noise really well - don't go on public roads with these.
Sound quality was great but I did have to run with the iPhone in my right hand otherwise the connection would die - I understand this is a pretty common problem.
However, the biggest drawback is that Every. Single. Footstep. made a deep 'thud' inside my ear. No matter how lightly I trod; Thud, Thud, Thud.
I did get used to it after a while, and the sound quality was great. In music, it isn't such a problem but listening to a podcast - not great.
Not sure whether I will keep them - if the thud wasn't so great and the bluetooth connection was more stable I would recommend them in a heartbeat. For £14 on Amazon they are an absolute bargain.
I might return them for looser fitting ones or just live with the iPhone earphones (which are actually pretty good quality anyway).
That's all from me