Keith looks at two metallic papers from Red River paper in the USA
Polar Luster and Gloss are 255 gsm RC style photo papers.
Making profiles and test prints show how the unique surface finish works well for certain types of images.

Are they worthwhile for your styles of image? Colour and B&W example prints show what sorts of photos Keith might think of them for.

The papers:
https://www.redrivercatalog.com/browse/66lb-polar-pearl-metallic-inkjet-photo-paper.html

See also Keith's tests of a similar UK paper at:
https://www.northlight-images.co.uk/permajet-titanium-gloss-300-metallic/