I don't own a whittler (yet) but this is pretty much my ideal selection of blades, and I'm not even a whittler! I like small secondary blades for precision cutting, which sometimes requires the smooth-gliding belly of a pen blade, and other times the fine point control of a sheepsfoot/coping/wharncliffe. Unlike a stockman, which has three similarly sized blades, with a whittler you get one full size and two small blades.
For me, it's the same idea as a two blade jack (my favorite EDC), having two drastically different blades for drastically different purposes, but better, since you get BOTH styles of secondaries, one straight edged and one curved.
Long story short, I want to subscribe to this thread as a spectator. It's not in my budget to go and buy a GEC right now (I want carbon and a long/skinny style knife) but I'll be keeping my eye on this pattern.