Something to consider if you are staying at Couples Negril or Swept Away:

If you use Club Mobay for arrival, but the Couples courtesy shuttle doesn't leave Sangster until everyone on their passenger roster has made it through the long lines, then what exactly have you saved? Friends of ours had this happen last year, and say that they won't pay for Club Mobay again. Yes, the Couples Lounge at Sangster is much more comfortable than standing in line, but Club Mobay doesn't get you to the hotel any faster. It probably works like a charm if you are catching a taxi from the airport.

My two cents...