I haven't spent yet. I wish it had a beginner pack or something of sort like "1 time only, will never refill, pay $10~15ish and get a random rainbow, Astra Galus (because they love her and every beginner's pack has a fodder character) and idk, 1 of each bronze manyu. FFBE and GBF are examples of interesting (and very different) uses of this tool.

I've seen some games with deals like that and after getting the pack I feel much more willing to spend money in it should a big necessity come by. The way FKG is now I just can't see me spending on it in the short-term.