don't listen to all those people who have rated this 2/3 stars as they are by far the best earphones i have ever had; extremely durable, comfortable and no they do not pull when you are wearing them.
the sound quality is fantastic, however one minor thing to note is that they are quieter (when on full volume) than some other earphones around, but that is probably obvious seeing as they are proper noise isolating ear phones.
i personally think they are great and i listen to music alot and have had many earphones where one side stops working or there are other faults etc. however i have had these for almost a year and they are just as brilliant as when i first bougt them.
for 17.99 they are amazing value for money and probably the best on the market. MUST-BUY! :)