Glad to see this as a topic as i bought the System X kit a month ago and just finally applied to one of the cars i take care of in my family especially before this hot weather in NJ today.
I also have and used Opti Coat and Cquartz. Funny but i would more closely compare System X to Opti Coat at least by their own description
From their website:
"
System X is a semi-permanent coating that actually becomes the functional surface of your vehicle's paintwork. By creating an inseparable bond on a molecular level with your paintwork you get a coating that cannot be washed off like a wax or sealant.
System X acts as a second layer of clear coat which provides increased protection against the elements.
This new clear coating is glossier, chemical resistant, and harder than the original clear coat. Providing incredible protection against minor scratches, swirl marks, acid rain, bird droppings, and harmful UV rays. Easy hand application only takes 15 - 20 minutes."
They also claim once cured the only way to remove is to compound it off.
That sounds a bit like the Opti Coat description, a coating and not a nano sealant.
In any case, since i've now used it, I quite like it alot. Application for is alot easier than CQuartz. Another thing that pleasantly suprised me was how slick the surface was after removal and even more so after it cures.
As those of you that know, OC and CQuartz are not really slick but thats not the whole purpose of them.
If the slickness holds up, and more importantly the advertised protection, i will have a new favorite go to that I would have no problem recommending to anyone. It would be nice if they came up with a QD or spray topper of some kind to maintain the surface.
I will say though, once you get your head around the lack of slickness - Opti Coat has proven to be everything it has advertised itself to be for me. I am still tinkering with CQuartz and Reload. Hope to report back in the future how they all stack up.