Reply to Fake Xone XD-20's

Does anyone know if there are fake Xone XD-20's floating around on the market? I recently picked up a set from EBay, and I must say I am not overly impressed with the sound, specifically the low end frequencies. These retail in my area around $100 at stores, so I figured they should be some decent in ear phones for listening to music on the go. But I cant really tell much of a difference between these and other $20-$40 headphones.
Could I have been taken???