So I'm a Petrus solver, I average about 29 seconds overall. I've been using Petrus for about 4 months now. Now today my friend told me he got a 15 sec average f2l, and I got angry. I I just tinkered with Friedrich for about 20 minutes, and I average 35 seconds with it, ALREADY. I find that horribly rediculous. Friedrich requires sooo much less thought it's just absurd. The only thing you need to be able to do, is relative position, which i got a grasp on and use frequently, and then slotting, which I don't even use optimally, but intuitively, but still succeed in. I find Friedrich boring, but the brute force algs makes it soo much faster, that Eric guy who averages 14 with Petrus is my hero now.