Pad rollback is pad retraction, same thing, more accurate description of what's happening.
Had Mt5s for years, loved them. Lever ergonomics were wonky but you get used to it, swapping the brake to sit inboard of the shift made a big difference. The guy who bought my old bike still can't get over how good the brakes are. He's supposed to drop it off for new suspension bearings and a fork rebuild soon, I'll probably bleed the brakes while I'm at it as they're a touch spongey, but they haven't been bleed since god knows when, probably late 2016/early 2017. I'm a big believer in Magura brakes despite their weird egonomics, pulled a 2005 Louis FR out of the parts bin trying to get another friend's bike back workings, it has never been bleed, hasn't even been used in 5+ years, still feels perfect.
Have Cura 4s now, far fewer miles on them than the Maguras, I like them for sure, but the jury is still out. The pad roll back thing is a bit annoying, if you get then smoking hot, the rotor warps a bit and it sounds like there's a mouse living in your rear hub, squeek, sqeek, squeek. The factory bleed was crap, and they're a bit finicky to get all the trapped air out of, had to reblead a couple times to finally get them dialed in, and they seem to get a long lever in cold weather, but I haven't been able to ride in the cold enough to really say for sure. I've only had them 9ish months, way too early to say if they're reliable long-term.
Between the two, I'd buy the Maguras over the Curas, but the gap between Formula and Shimano or Sram is impossibly wide.
