For B2X, you should wait a day or two to see what's happening before making a transaction.
Do
not transact B2X unless you want to lose your Bitcoin. There is
no viable replay protection.
Is anybody following what's happening with this? Last I heard, opt-in replay protection was being removed, but the BTC1 folks were discussing strong replay protection via the OP_RETURN script. I certainly hope they add strong replay protection because people are inevitably going to try to split their coins to sell the B2X. And using nLocktime + RBF is really not intuitive for novices.