I got on well enough with them with my XT brakes and my old Tektros but they don’t seem to work as well with smaller pads, much more pulsing/roughness.
The direciton arrow thing is weird, they changed their minds about how they should be run after a while so old ones say to run the opposite way round from most rotors, new ones say to reverse that. So one of mine said to run it one way, the other the reverse.
There’s a picture that does the rounds of a horribly folded up one, but it also has obvious scorching on it- looks like it’s the result of some sort of uneven heat torture test using a gas axe, rather than a real world failure.