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Dogs
They're very, very good brakes, which are also a pain in the arse to get to work to their full potential.
It's my belief that more often than not, they're not working to their full potential, as the sheer time required to bleed them fully is beyond the scope that a bike shop feel they can charge for.
This is probably concealed by their performing very similarly to (say) some Shimano brakes which are at 100% when the Maguras are at, let's say, 60%.
Upper threaded hole in this picture is the bleed port:
This is the reservoir, the cylinder which forms it's rear wall is the master cylinder, so you have to get the air out of the master cylinder through the two ports halfway up the cylinder, then out through the port at the very top which goes to the bleed port.
Helpfully, the angle required to get a bubble to rise into the bleed port is the angle that will prevent all the bubbles moving through the port that leads to the bleed port - which is why these are such a pain, you have to move the lever through a multitude of angles to chase the bubbles up into the bleed port.