I just returned from 40+ days out on the island and only visited Negril a couple of times for an hour or two and came in contact with the SOE forces several times at different check points. One time we were "extorted" for $1000 Jamaican by a soldier which was irritating and, other than the wait to pass through the check points, the minor inconvenience is worth, in my opinion, the reduction in serious crime most everywhere on the island. If you are staying in the Negril area you will probably not encounter a Check Point except for on the way to Negril which you will just be waived through most probably.
I assume you are coming from the US (your profile doesn't show a country) so any price increases will be offset by the higher valuation of the US dollars you exchange so that should not be much of a concern.
Uncross your fingers and have a great trip.