I can't speak to the USPP other than one of our dispatchers (when we had local dispatch center) came from there and spoke well of them. As far as the FPS goes, they are still undergoing a transformation with the move to DHS. For years, they had to answer to building managers and there was no requriement for the brass to have any LE experience. That's all changed. The current commissioner is a former Deputy with the USMS and he's begun a change from the top down. However, the FPS still varies greatly from region to region. In some areas, the FPS don't operate 24/7 and rely more heavily on the contract security while staffing more Inspectors (LESO's) than Officers. Check in your area for specifics.
Law abiding citizens sleep peacefully in their beds, solely because dedicated men and women stand ready to do violence in their behalf.