I’m not sure where the bombproof reputation comes from, I had one for a while…
Drive side bearing is from an rubbish isis BB, they are not well sealed and the small planet gears wear at an alarming rate.
Any shifter will work with them, I used an xt. Drag is not much of an issue but the small chainring makes sus bob more bobby.
It’s a good idea poorly executed. I was happy to go back to a front mech.