I use an 008 on probably 90% of the cigars I smoke.  Obviously I kind of like it.  
 
If the self sharpening feature works, it doesn't work well enough to suit me.  I use a cone shaped Dremel grinding bit to keep it sharp.  I sharpen it every six months or so.  I just rotate the bit by hand in the punch - doesn't take long before it's better than new.