are they any good in shallow/mid/deeperwater, do they still make the blades, a birdy tells me no, but they come with inter-changeable blue/black blades, the black is the harder & stiffer,the blue the softer apparently,how much should i be paying for them, a worldywise bunch of wannabees & has beans like me, ought to know,but maybe its just me,can anyone throw there tuppence or grotes worth in ,mucho wanna know .scratching my head dot com