Received and installed the new "subscription" QD 2018 today with no problem. Not seeing ahuge number of UI or functional changes, although the ribbon icons are a little different.
The only major change is a little pending update reminder at the top of the window. Apparently there is a "free" tier of up to 15 bill pay transactions available now.Quicken wants me to enter a bunch of bank related data to activate this. I don't use Quicken BillPay now and not sure I want to in the future, but I can't make the reminder to sign up go away.