I had 250+ ping playing from SEA region and have had no problems dodging AoEs (I do experience a bit of GCD clipping when double weaving, though). The move might bring it down to 170-200 which will most likely be unnoticeable for me but there's still the chance that it might make the game unplayable. If that happens I will either have to transfer to a JP data center (if they give us a free one + lift the gil restriction) or just quit.