I've just purchased the Bowers & Wilkins P5 headphones. I got them from the Apple online store without trying them before buying. I was very reluctant to do this, but, as they're exclusive to the Apple Store, and because we have no physical Apple Stores here in Ireland, I had little choice. So far, I think they sound great, look great and feel great. They're my first pair of over-the-head 'phones. They're comfortable while on, but I've noticed that if I lean my head forward or backwards, they're inclined to slip, or even fall off. Is this normal for this type of headphone? I expected them to be a little more secure on my head - but maybe I'm crazy. I (think) I have a reasonably normally sized and shaped head.