I've bought expensive and cheaper earphones and have been disappointed in the past either with the sound quality or the fit. I thought I'd be safe with a well known brand and spent a bit more than I normally would and have been pleasantly surprised.
The fit is comfortable, albeit the contours of the earphone taking somewhat getting used to but once the earphone is comfortable the sound quality begins to shine. From an earphone this price I must say I'm impressed with the quality of the sound, the buds easily cope with all but the heaviest base and keep both treble and base nicely balanced.
Ultimately, I expect this pair to last a while due to their robust build, but if they need to be replaced in the future I'll happily buy another pair.