I have two repeaters working with my ID-RP2C interface... VK5REX B and VK5REX C.
VK5REX C is off air at the moment, I am awaiting a new duplexer to arrive.
70cm VK5REX B is working very very well. The Motorola MCS2000 radios work perfectly with GMSK D-Star. I have also been able to remove the DCI bandpass filter and Advanced Receiver Research preamp from the receiver. I have not experienced any problems with the home-brew 70cm D-Star repeater at all... it just works!
The K8BIG 70cm and 2m repeaters in Cincinnati Ohio are also using my interface design and Kenwood repeaters... and several hams have built versions of their own design based on my schematic.
Check the video on the bottom of this page... from Armando in Italy
http://www.ik2xyp.it/progetti/dstar/video.htm
Michael.
VK5ZEA