Well when I look at my HD600's I see cheap foam, flimsy looking materials. it's pretty much the Ikea of headphones.
Look good but when you inspect them and look up close they will do the job but build quality is suspect for the price you pay.
Compare directly with the fidelio X1 and you wonder why they are so expensive. The when you put them on you know why, it's the drivers.
Sennheiser aren't built like tanks like the fidelio x1 is. Sure it should last 10 years if you look after them and change the earpads when worn. But I don't exactly feel secure about their strength, the materials used and how they look up close.
The headband is a major sticking point and the tacky foam they have tacked on, it looks and feels cheap. would have preferred if they had covered it with some material or used some other method of padding.
The headband on panasonic HTF600's is superior in comfort and looks (£28 headphones), in fact I would say build quality is on a similar level to them and they never filled me with confidence either. The only area where you can see high build quality on sennheisers are the grills, wiring and drivers.
