@MAD_AI I'm 50/50 on AMD's Mantle api... Seems like it'll add a lot of work over just throwing everything into Direct X & Open GL... So I doubt a lot of devs will make use of it, even if they do what are the chances it'll need updating everytime a new gpu comes out.
Not being an expert I can't help but think lower level = more chance of problems... Though if it does turn out well, it will be great.
JimmeyBurrows' comments