My son's stopped using his Barracudas 'cos too many people were saying that they couldn't hear him very well - the mic does seem to be positioned too far away from your mouth.
Personally, using them for Skype, I got very good results.
For the price, the build quality is shockingly poor.
And a bit tight for my fat head.
He bought some Steelsound phones to replace them. They don't impress me too much - you can hear everything going on around you, no audio encapsulation at all.