Good sound quality (as should be expected for bud headphones), they are good for listening to bassy music too :)
They do stay in my ears very well, I have done running with them and its been a very secure fit. Totally noise cancelling, so they're good to "escape" from your surroundings.
Only problem is i've lost the ear buds from them :/ not really the fault of the headphones, more of me being clumsy. There doesn't seem to be anywhere to order new buds.
Ordering 2 pairs of these now, fantastic price they're double everywhere else.