Just booked my return tickets:
2x DUB-ORD-MIA, on American Airlines, economy, one-way, 30,000 EY miles + US$70.66 per ticket
I called the US number and reached the Manchester call center. I talked to a very nice, patient and knowledgeable agent.
It took about one hour to complete the booking.
I already had 40,000 miles in my account to cover the cost of 2 off-peak tickets on AA back from Europe to the US. SURPRISE... off-peak 20,000 miles award is only from the US to Europe, not Europe to the US (it's on the chart)! So I had to transfer more Amex MR points while on the phone, to complete the booking.
Very positive experience again, and I would not hesitate to book award through Etihad in the future.