I had a C-28 driving an MC-240 for several years. Very good combination. I also drove aa pair of mono'd Hafler DH-500's with the C-28 with excellent results. Now that I've gone to all Audio Research gear, I don't think I could go back to the Mac stuff. The Mac's sound nice and musical, but ARC combines the musicality with an amazing amout of resolution that the Mac just can't.
The best things about the Mac gear is that it's built like a tank, and the resale is always great.
Corey