The inlay feature has been around for a while but until recently it has always failed me. One problem for the inlay feature is about size. Larger pockets and inlay work better for me than really small ones. That is partially due to the face that wood being an organic product does not always want to cooperate like metal. Do trying to do fine lines and small objects has not worked well for me in the past. I recently completed a plaque that turned out quite well.
@wmoy had suggested a .2" deep female pocket and a .18" depth for the male inlay.
Here is a link to that post.