Has anyone used these? I've gotta start doing Aswan more on my Phantom and just remembered these things were in the Cash Shop.
The description implies that the locks raise the rank of the IA up to either B or A, but I don't think that can be the case. Do they just freeze one line and let you circulate the other/s or does the lock simply freeze the rank, and regardless of which Circulator you use it stays at whatever rank it was previously?
Considering using these if they're at all worth it in my quest to get 100% critical rate.