Is silverstone the only plug-in for metallic ink printing?

Is the Silvertone plug-in the only one available for use when adding metallic inks to images for print work? If it is, does anybody have good, bad or indifferent comments on this product?

Or.....is there any other way to get good results in printed work when adding a metallic ink to the project without using Silvertone?

You could simply use a gray ink...then told your pinter to replace it with a metalic ink...