Are you talking about PU metaldeck?
https://www.google.com/search?q=pu+metaldeck

My opinion: I think this is the best roofing material. Lasts long, insulated from sound and heat, low maintenance, reasonably cheap, and I think it looks okay. If you actually use it as a roof, then it is low slope capable too.

Against it are the look might not appeal to everyone and that if you require translucence, then of course it is not suitable.

The link in my original reply has some videos, and the installations look decent (to me) with the hidden gutters and hidden edges. Also no need for underside cosmetics as it looks okay from underneath too.