Based on the quote below from Michael Fremer's review of the BMC MCCI he does not think it is the best, and it is not compatible with some MC cartridges.
"I'm not suggesting the MCCI is in the same league as the Ypsilon VPS-100, Boulder 2008, or other top phono preamplifiers that I've heard. It skimps somewhat on instrumental textures and timbres; and the bass, while very well extended, doesn't exhibit the control and stability those manage."