4 Good but prefer the PX-100bigstevejw | 06/12/2011 | See all bigstevejw's reviews (3)I bought these as I left my PX100's on a Virgin Atlantic flight! The sound is great, however I am not so keen on how they sit on the ears. They tend to slip forward a bit (could be my ears I guess)! I felt the PX100's sat better as they are slightly larger. Wish I'd gone for them again, but as I said the sound is good and the bass is also good.