120 CCF for 1350 crystals popped up in the mission shop for me. I've seen people say it's hard to acquire these. Do I jump on this, or is it not worth it?
Do it, i would personally do it. That will cut whole week of grinding
If CCF are harder to grind than money for you, then go for it.
Depends on which is rare to you crystals or CCF, I mean if you f2p then don't go for it or if you have supply of enough amount of crystals then go for it.
I wouldn't. I don't ever spend crystals on upgrade materials. I'm sitting on nearly 2k CCF right now. Farm, farm, farm.