I got mine with ''First, middle, last names'' filled in separately. Saw that YGN embassy's post later and for my wife and kid, i filled full names in the first name option.
Both methods worked fine. No questions asked by the airline or the immigration.
Anonymous participant nothing. I sent a followup email, no reply. My timeline was, submitted on Thursday, additional docs requested on Monday, docs submitted on Tuesday, status changed to ''Pending Approval'' on Wednesday, rejected on Friday evening.