I have the GT16, only had it 2 weeks now. I looked at the FAMC, and really considered it. Seems to be a lot of power and features at a great price. But, I went with the RJM for several reasons: it already has AxeFX3 integration, the 16 buttons is just right for me with my main effects on P1, a second page, and IA mode; plenty of support help and documentation to get up and running in the start and as I grow in complexity, and I would probably have to get both the FC6 and 12 to do what I want button wise, so not much more than the fractal solution when it gets here.
I am very happy with it. There was a learning curve, and I'm still figuring it out as I discover how powerful and feature rich it is. I'm using a phantom power midi box, and just have to run the one 7 pin cable to the GT16. The Mac editor is awesome too.