Hi Gil, I have few blockers:
there are some issues with checkouts using multi-step checkouts or review step. I wrote about it here: [Bug] Cart validation functions - two issues blocking migration from useBuyerJourneyIntercept()
Also when using Apple Pay / Google Pay buttons on product page, validation functions prevent from going to checkout and displays unhelpful message: [Bug] Cart validation functions - Apple Pay / Google Pay shows unhelpful validation error on product/cart page
Let me know if you need more info