I haven't actually tried the 612 brakes, I was very close but ultimately decided I there just wasn't enough info out there. I listened to some podcasts and interviews with the founder/owner of 612, I got the feeling they are basically a re-sculpted Maxima. He aimed for the same leverage, piston sizes, and mc sizes as the Maxima and ran with that on the 612s. They are obviously aesthetically very different and I'm sure they are functionally a bit different, but I gather not by much. I could be wrong. You can select hose types/material, they use Hope pads, mineral...