Just recieved a Mini AFCK in ATS-34 as a gift and am considering returning it and getting the M2 version instead. I would like the edge holding but am concerned with the ease of sharpening and rust resistence. Is the M2 AFCK that much better? BTW as to the BM quality control, the one I recieved is darn near perfect. Nice even grind, blade centered, liner lock adjusted just right, and very smooth action, I am impressed.