I have been on mavic and dura ace wheels but recently buying DT wheels. first I got the disk RR1300 C wheel and later the RR 66 DICUT C. Now I have the new 2013 RR 21 DICUT wheelset for 4 weeks now and wanted to share my opinion about these.
The hubs are the 240 quality we all know of in a 11 speed shimano body. The rim is not the lightest but benefits in stifness. It is stiffer than my wh7850 C24 alloy wheels from shimano. The front wheel is 640g excluded rimtape and QR. and the rear 810.
The new QR are ratlle free. The old ones did make some noise. Still I am using my dura ace qr because in competition they are faster.