Agree with han. While nasty convential responses are fine, the most effective thing about them is that they make the auctions competitive, which will make life harder for the opponents (regardless of their system, tbh, but especially against systems where perhaps the opponents cannot draw all the subtle inferences they can when their space is limited). Just bid against their artificial openers and they will have a tougher time. I personally like a style with natural overcalls... against NT I like dbl is majors and NT is minors. EZ game.