After reading the PotM guide the other day.  I decided to try it out.  Would have tried it yesterday, but due to unforeseen bleeding from the gum graft I couldnt.  I played a pretty good Potm.  I got my Starfall and my Elune Arrow to hit.  I even shot one at a 45 degree angle and had the enemy run into it.  I even used the invis spell to get a gank on two of their heroes.  I can see why this hero is such a popular pick in competitive games.