Definitely the Mr Surfacer line is awesome.I've tried Stynylrez and don't like it. Shelf life is somewhat limited, prone to freezing in transit and difficult to get out of the airbrush if it sets up a bit.
My current favorite is Mr Fine Surfacer 1500 1:1 with Mr Hobby SLT.
Same here on those colors but not as much luck with the white like Jakko mentioned. I actually used the silver primer as the paint on a couple of P-51's I built. Gave them a more subdued silver color not a chrome like shine. It doesn't show tape marks when I masked for painting and I've yet to find an acrylic silver that doesn't show masking tape marks when removed.Mmm , maybe the case .
I've had good performance from the black , gray and metal ( silver ) .
Never used the white .