I first bought the driving light version of the 520 lamps and found that when cornering, the lean of the bike made them useless. The narrow beam height made the outside light pattern go up in the air and the inside light pattern go down into the pavement just head of the bike. The ATP lens with its taller pattern keeps more of the beam on the road ahead when cornering, It's not perfect, because any projected lighting has to limit its height, but it is much better. Overall the 520 ATP lights work well.