Personally I've found a spey blade useless in whittlin'. A sheepfoot, pen, and clip are all I've ever used whittlin'. That's just me. A spey blade may work well for others.I would submit that for whittlecarving a sheepsfoot/coping/wharnecliffe is fairly essential for scoring cuts and the straight edge for controlled material removal via draw cuts. A spey can be quite handy for scooping out areas, say between scores made by the sheepcopewharny. A pen or even clip kind of bridges the two, providing a point and a bit of belly.