I'm using Petrus method at the moment, which means all my LL edges are already correctly oriented on arrival. I've reached the stage where I'm going to have to start getting the whole last layer down in less than 4 stages. Is it worth just learning Fridrich from here on? I'll have less OLL to learn, what with the edges already being there. Do any other Petrus users know if it makes any difference at all, learning Fridrich or learning those methods Lars demonstrates on the site? One better than t'other?