Did a lot of test prints on an expendable mug with some success.  Decided to risk trying a monogram (1st) for my wife.  Turned out so well she "commissioned me" to do another for her (sunflower 2nd).  I'm not sold on the settings yet, still wondering if I need to adjust based on color of mug.  If the power is too high you scorch the stainless, making the engraving darker.  If anyone has any tips - please share.  I have about two weeks experience with laser engraving.