Christmas came early for me: picked up a UMC-200 which arrived last night. Ran through the initial setup last night, though I'll fine tune this weekend.
On the upside, it's a lot easier to maneuver around in the cabinet since its much shorter and lighter. It also seems to run fairly cool, so I'll see how things work out without any fans in the cabinet (had a couple of 120mm fans on the Onkyo previously and it was still quite warm). So far so good, though I haven't really "tested" it yet.