To me, it's worth it, and useful, when I gig out, although I'd really try to find a used on, if they go for that much over there.
If I'm just doing bedroom studio workouts, I hardly ever hook it up - so if that's your situation, I'd say, "No, not necessary".
I tried the FCB1010 and GCP - both required a pretty extensive bit of programming to make them useful, and you don't get tuning or name functionality. You "can" program in a preset name with either of these, but if you change a preset on the AxeFx, it still stays the same name you programmed in on the FCB1010 and GCP. With the Fractal MFC101 it's ready to go - if you change a name, or a block function or state, it automatically updates, and shows the state. The first two pedals had some functionality, and weren't entirely useless, but the MFC101 was made for the AxeFx.