Question - Arriving in the US on K1 Visa...

Those who have already entered the US on a K1 Visa, which airport did you fly into and how long were you held/questioned at customs for?

Also bonus question, did you book a 1 way flight or a return? One way flights to the US from the UK for next February are twice the cost of booking a return (I would book a return for the end of the 90 days, and then of course not use it).