I loved my Wave Rider 12 and have been sad to see them slowly go out of stock.  Mizuno definitely tried to save money on material as these were much smaller.  The dig into my heel (a complaint I read in other reviews here) and are much smaller in the toe area, too.  I would get a 0.5 size up if you're going to order them.  They are much stiffer than other Mizunos I've had, too, which some people might like but personally I don't.  I've run a total of 5 miles in these so far and I think that will be all I go.  I'm putting on my old Mizunos with the sole falling off and all :)