We've used a bit of the silver metallic recently. I can't speak to long-term durability, but we've printed a few wraps for other shops and also did a couple for our own customers. Looks amazing, makes anything metallic (obviously). It is a bit thicker at 3 mil so it doesn't stretch or conform quite as well as a 2 mil cast laminate but it's not significantly harder to install. We didn't push it too hard, I'd suspect it would present some challenges on some really extreme compound curves though.
Beyond just using this as a wrap laminate you can create some really cool "spot varnish" effects on other sign projects as well. We did a flat Dibond panel for a customer with a matte finish (printed on our flatbed) and we overlaid the metallic gloss laminate over just their logo and some accents and it really made the sign stand out.