I REALLY wanted this to be along the lines of Dirac, which I use on my main workstation in my study and my music laptop in my media room. I also have the MultiEQ app on my Android phone and tablet, and I have experienced reasonably good success with it, after spending many hours of measuring with the included Denon mic, then re-measuring with my UMIK-1 and REW, then tweaking the target curve, re-measuring, re-tweaking, re-measuring, repeat, repeat, repeat over a few days with an empty home.
I can do a lot of that in my spare time before I start to think $200 might be worth it per AVR--especially if I use it as an excuse to drink good beer.
With Dirac, the calibration process takes a few hours on exactly 1 day--all with the same calibrated mic. AND, the PC version of Dirac Live Standalone license extends to something like 5 PCs in the same household, with a lot of flexibility, at a cost of $350.
The only thing this gains me, other than time, is sub integration that Dirac cannot have in my use cases, but that is not to say it is not possible in other use cases.
For those concerned about the usability of the $20 MultiEQ app, things get much more precise with the addition of a $12 Bluetooth mouse and especially a tablet-sized screen.
This is where things sit after several iterations with the far less expensive, more time consuming MultiEQ app / REW process described above. Not bad at all IMHO. Should I find the time, I could improve it even more, but it sounds damn good to me now.