ive been told ups and downs on this subject. this has been covered several times. some people say there not worth the money(but i dont see why not) and some belive in them. there the perfect street strip car piston to me. good for light nitrous shot. they do shatter. if you cut one in half it looks worse than a cast piston cut in half. they look like swiss cheese inside. it kinda hard to explain. but what metal is there is stronger than the cast. i happen to be a fan of this design. when they first came out i think they were advertised as "stronger than cast lighter than forged". they are not as strong as forged in anyway. but as everything else in this world they have there ups and downs.