Compared to almost all the other ear defenders and ear muffs, these look the best and cancel the most noise. A month after purchase and alot of violence, they still look and work like new. I shown these to a few friends and they stated 'wow... I can't hear myself speak' and 'I should use this for when my girlfriend come round!' (True pun intended).
At the moment my main use for this is for flights- When I watch a movie or something, I put my earphones on and then these over them (basically a cheap, yet effective set of noise cancelling earphone-headphones).
I'm very pleased how this all turned out. But A thing you need to know, it takes more strength adjusting them then it takes to win an armwrestle!
So as a conclusion; Great build quality, worth every penny and works brilliantly!!