I have the DC20-10 but they are the XL version, which has ANR (Active noise reduction). They are very comfortable, and don't clamp your head like some of the other DC models. I have them 6-7 years now, and not a single fault, and they look the same as they did the day I got them.
Only complaint is that the clamping force is quite light, and if you turn you look down and then back up very quickly, it's possible that they move on your head.
I wouldn't buy anything without ANR/ENC (Electronic Noise Cancelling) if you're planning on flying for many years to come.