I've never had an issue with Synergy but I have a dark blue car not a black. You know what you're doing Fightnews when it comes to cleaning and protecting your car so I'm not doubting you. I'm starting to wonder with Synergy if it just doesn't work on some clearcoat types? The reason I say that is because people either love it and it's great, or it's got issues and leaves streaks. I remember a black BMW that Mike Philips did that he put the pictures on here that were done with Synergy.
Plasma Coat is not ceramic in anyway, it's a non-polymer based sealant that's quite effective at protecting the paint, and I've used it and it's quite durable. My dads car is half High Def paint sealant and Half Plasma Coat. They're both still on the car throughout the winter and I polished and sealed the car in November. And keep in mind, my dad washes parts of his car with a mop. So. Ya.