I've had a pair of qc15's for years but I picked up some qc25's over summer. They're no different really, apart from you can listen to music when they're 'off' - but as @ExTra said it sounds rubbish.
I get what you mean about the funny sensation, when 'turning them on' it can feel a bit like pressure on your ears even though theres no sound. But it's not caused me any problems and I find them comfortable to wear all day - but try a pair out first. For long haul they're excellent, but I would consider a decent pair of in ears next time.