vary it up a bit bro. don't do the same routine for too long or you'll stalemate. my 3 day split is as such:
mon - legs/bi's
wed - chest/shoulders
fri - back/tri's
about to change it up again to keep it interesting. if you're getting bored with your current routine, change it up. if you like it and you're constantly improving your lifts, don't change. JMO.