I need a Sawzall. For casual destruction. Corded, I won't use it enough to mind a battery. Are the blades of one model (same brand) compatible with those of another model? Ie Makita 7B vs 16S (made up numbers; you get the idea) Are the blades of one brand compatible with the blades of another brand? ie Makita v PorterCable This weekend I need to slit a 2x6 lengthwise, cutting through the 5.5" part, for example. (and the board is only accessible to a jigsaw-like tool.) What other features do they offer? What brand do you like?