As per their official update on the fork, they also stated that it may take several hours, or even 24-48 hours, for services to be up and running again.
I thought this would be important for Coinbase users to know, I happened to stumble upon this information today.
This also effects GDAX users.
So if you don't have a hardware wallet, you should decide on how much you're willing to have locked up for these time periods.
I am not 100% sure I want to make any transactions even days before/after the fork. I don't think it's worth the risk of a replay attack.
The link explaining this info is :
https://support.coinbase.com/customer/portal/articles/2892985-segwit-2x-faq
Comment with any new discoveries and let your friends know!