I owned the C-541i and the Audio Refinement cdp a while back. I had been using the NAD and thought I'd try the AR. The NAD was much more alive to my ear, plus I got hooked on HDCD. Many more cds are HDCD encoded than you'd think. Many have no labeling but are HDCD encoded.
I sold the AR after about a month of comparing them. The NAD was in my systemm for two years without a glitch. Basically, the AR complete integrated was a much better product than the lack luster cdp.