The physics of the driver is fundamentally different between planar magnetics like the Magnepan panels and true ribbons like Apogee and Magnepan's ribbon (not QR) tweeter. Magnet placement is different and a true ribbon is generally a much lighter membrane (typically foil, no mylar backing). They both have their pros and cons, natch... There used to be pictures on the Magnepan site and some description of the differences.
The Apogee transformer, especially the first one, is rather infamous but did transform (ahem) the load impedance to something most amps could drive. It has been ages since I heard an Apogee system; at the time (ca. 1980's), the amps I recall driving the low-Z models were Mark Levinson, Krell, a Threshold Stasis (though IIRC it was not happy about it), and one or two tube amplifiers designed or tweaked (modified) for the load.
I remember reading the patents and have (had) them filed, somewhere, but at that time I was a college kid and barely followed the legal case. There was also a little buzz with a couple of the ESL manufacturers regarding Apogee's and/or Magnepan's advertising, I think, but again not sure what if anything became of it.
I lived with my Maggies from ~1979 until maybe late 1990's before storing them as Life and Work took over and I had little time to listen. I resurrected them around 2008/2009 in my main system after we finished our basement, adding a quartet of MC-1's and a CC3 to supplement by old but still working MG-IIIa's. Still have them, but changed to a Revel system a few years ago as my "last" system. We'll see... There are things about the Maggies I miss, but the Revels do well enough for me that I've not been tempted to bring them back (or upgrade). Of course, with the kids out of the house, less fear of a hand or toy going through the screens...
Still, grandkids, maybe, someday.
On-topic: In years of working at a dealer and as tech, then as simply a customer, that sort of service seems very un-Maggie-like. Certainly I don't know the whole story, but it sounds like things got out of hand and communication just wasn't what it should have been. There were times in the past when Magnepan had assembly problems and was slow to respond to customer complaints, but most of the time they offered outstanding customer service and demanded the same of their dealers.
FWIWFM - Don