If you mean a Pressurisation System endorsement, anything that gives you the drop on your competition is worth considering, if you are at the job search stage. Apparently a large jet operator is now accepting applications from very inexperienced pilots, as they realise that the next generation of First Officers may wait 15 years or so for their commands. No point in taking well qualified pilots as they will only get antsy when their commands don't come up a year or two after they join.