For more than 25 years I have used Maggies with true ribbon tweeter (MG 3.3, MG 20 and now 20.7) and not once has this driver failed. Even my old 3.3 with the protection fuse replaced by a copper bar could handle realistic sound levels without any problems. So don’t let their presumed fragile construction hold you back, just make sure the cleaning lady keeps the vacuum cleaner away!
I agree Maggies are not particularly hard to drive with their even 4 ohm load, but their low sensitivity does require sufficient power. But they have slightly improved on this over the years. The 20.7 now has push pull quasi ribbon bass panels, which are more of a kind with the push pull quasi ribbon mids. This made it possible to do away with that large outboard crossover box of the MG 20 and 20.1 which ate up lots of amp power. Still, don’t expect them to make music on a low powered SET.
I agree Maggies are not particularly hard to drive with their even 4 ohm load, but their low sensitivity does require sufficient power. But they have slightly improved on this over the years. The 20.7 now has push pull quasi ribbon bass panels, which are more of a kind with the push pull quasi ribbon mids. This made it possible to do away with that large outboard crossover box of the MG 20 and 20.1 which ate up lots of amp power. Still, don’t expect them to make music on a low powered SET.