I just signed up for the standard plan, expecting to use this import feature, only to find that even though it is advertized as part of the plan, it is not yet available?????
Okay, bait and switch? :-0 How soon? ETA???
So reading the link, the importer is really a crappy way of migrating a site, from what I can tell.
There were some issues that we've found and decided to pull it to fully correct.
I don't have an ETA on when it'll return but the workaround suggested in the thread is the way to go or simply import using FTP for now.