Ribbon midrange pros and cons

I live just 40 miles from where Apogee was.
I suspect they were not prevalent on the west coast because they were very expensive to ship and very fragile which would have added a lot to the cost.
Scintillas destroyed more amplifiers than any other speaker I know of which interestingly enough made them a very popular cult item. They were ok but not near as sonically correct as the Divas. If you did not listen above 95 dB the Divas were fabulous. Their real talent was in the mid bass region. Upright acoustic basses were unbelievably real on these speakers. Only electrostats are capable of that kind of realism. Magnepans come very close. 
All planar dipole speakers have significant acoustic advantages over drivers in a box. The only place they stumble is in the very low bass. A subwoofer array fixes that,

Having owned Apogee Divas for 16 years I feel a bit qualified to talk about this. There are very few true ribbon speakers on the market. Mostly you see small ribbon tweeters and for many of the you can get replacement ribbons. Magnepan has a tweeter ribbon replacement program. They will send you a new set of tweeters and you send them the old ones back. All for a minimal fee. They rebuild the old ones and give then to someone else. The magnet structures are very hard to damage and they essentially will last for centuries. All ribbons are very fragile. If your wife tries to clean the speaker grill cloth with a vacuum they will suck the ribbon right out of the speaker. Magnepan uses what they call a quasi ribbon for the mid range driver which is a mylar diaphragm with wires in it which is more like a planar magnetic driver. Much tougher. The Diva used pure ribbon drivers throughout and under the right circumstances they sounded wonderful. But, there were problems. It was hard to get them up to 100 db even with subwoofers.
The ribbons stretched over time. The ribbons were very easy to damage physically. My nephew kicked one of my woofer ribbons at the age of two putting a big dent in it. As soon as Apogee went under I sold them and put my old Acoustats back in service eventually solving all the issues I had with them. Good electrostatics are immortal. In order to hurt the Acoustats I would have to drive a stake through them and boy do they go loud. Magnepan tweeters are the most durable ribbons I know of and boy are they great tweeters I tried to buy a set from Magnepan and they would not sell them. I also think Magnepan makes the best dipole planar loudspeakers that are not electrostatic and they are absolutely a fabulous value. It is also a great company to deal with. 
Over all I think you are much safer with dome tweeters then going for ribbons with point source speakers. Once you go linear array then you can not beat Magnepan's tweeter until you go electrostatic. m