I've been a Magnepan owner for 35 troublefree years. My MG-1s were sent to White Bear Lake for a factory rebuild....this was before I'd even heard of MUG or the like.
Once setup and in-place they are no more trouble than any other speaker. Take the time, do it right, make the last adjustments hours....or even days apart as you fine tune.
However, they ARE a modifier / tweakers dream. Stands? yes. Bi amp? Of course. Tri amp? why not? Active/passive crossovers? for sure. Total reframe in hardwood? NOW you're talkin'! Get rid of that fuse? What took you so long?
I rotated mine so the pole piece faces the listener, not the mylar. Nobody can say exactly when the factory made that change.
Ribbon problem? Buy the kit from Magnepan or ship 'em....with 'core' charge.
Kit comes with 3 rebuilds, so when you screw the first one up, you are still good to go. Pulled wire? (bananna'd) fix with DAP.....plenty of online helps.