These are the most detailed earphones I have heard so far! I have to admit, I had my concerns at first due to a lack of bass compared to my old Sennheisers but after a quick Google search it was evident that they do not really start to kick into gear until they have had 60 Plus hours of music played through them. This (as I have now learned) is a standard thing for all good headphones.
The Tips you get with these headphones are very good. I used the standard ones fitted as I felt they worked fine for me. You do have to get a very good seal!! And I have to stress here, you do need to play around with them until you find it but once you have (like riding a bike) its easy to repeat there after.
If you look around on the internet it becomes clear that bands like U2 use these guys headphones with custom tips, which we as mere mortals can buy at our local Boots for a little extra cash (something I am now thinking about).
Im so glad I have them.