Just returned from a 2 week stretch and can say it works well. They have changed the process. Submit the online form and now you receive an email confirmation. Once you make your way to the immigration hall, you now need to go to the kiosks to the left, then a bespoke line to see an officer.
I'll also add I was surprised to see that since April they added XRay machines to the customs area. Once you claim your bags and proceed to exit, a couple of the lines now contain Xray machines and bags are randomly scanned. I assume this is to control the firearms situation, just a shame they do not put the money into more patrols between Jamaica and Haiti.