The XMC-1 users seem to be pretty happy about their Dirac room correction (which is finally,
finally available on the XMC-1 as of mid-December). You can read more about their experiences here to help with your decision:
http://emotivalounge.proboards.com/thread/38893?page=57
I have considered getting an XMC-1 myself because:
- My current Emotiva pre-amp has flaky HDMI negotiation
- Emotiva fixed the HDMI problems and other flakiness, which plagued many (most?) small companies making custom HDMI products a few years ago.
It doesn't hurt that I have "40% off any Emotiva pre-amp" card.
The only reason I haven't (other than the remaining cost) is that the XMC-1 doesn't support HDMI 2.0. Thus, while it does support 4K TVs, it does not support them at 60Hz. Big deal? Only if I want to use a future 4K projector as a PC monitor. This is a remote possibility, but it seems unwise to buy a $2000 pre-amp in 2015 which doesn't support HDMI 2.0, regardless of Dirac support. I'm hoping they plan to release an updated version soon, but have zero evidence that such a thing is in the works.
As an aside, the following video provides some evidence that room correction is not all that it is cracked up to be. The video discusses cinema, but some of the ideas may apply to home theater:
http://youtu.be/6qZ3MWsOhvo