We always had excellent WC service in SXM, always waiting for us as we disembark an aircraft and get us through emigration in no time. Last November we had two of them arguing who is going to push the wheelchair and the second one said I will carry the luggage then and took it all way up to steps to the aircraft door.
Also EWR and PHL always provide a good service. Never used MIA service so can’t compare. Flying to Athens and Istanbul in July so will see how it is there.

Luda