Maggie owners (past, present, future) what do (did) you love and or dislike about them?

Owned Maggie’s back in the day. They tend to give one audio nervosa! 
The positioning of the panels is always crucial...
and they were very difficult to drive. I always felt that they really couldn’t push much air and were somewhat restricted when it came to dynamics. OTOH, when all cylinders were firing, they were a very nice sounding speaker with great ability to portray strings and mids. 
I recently heard the new 30.7’s...
very impressive indeed, with a surprising amount of dynamic jump and decent bass response, but they need a very large room, and a stout amp upstream.

LOL, audio nervosa. I believe the majority of us are afflicted. You say they were hard to drive, what amp did you drive yours with? I have a Primare A32 amp capable of delivering 400W per channel to 4 ohms. Adequate?

Your Primare should be adequate. Barely, lol,
i was using a Hafler ss amp, can’t remember the version, but it was his biggest model. Didn’t sound that great, but we are talking back in the day.

I've owned a few sets of Maggies over the years. In the late 70s I owned a pair of MG1s, then a second pair running side by side. Double Maggies were all the rage then. I was driving them with a diy class A amp that delivered about 80 wats per channel and they sounded pretty good for their day. 

I switched to a 3 way dynamic speaker because I wanted better bass and better slam. 

A few years later {early 80s), I bought a pair of Tympani IVs along with a pair of Entec servo controlled powered subs and was driving them with a Levinson ML3. This was pretty state of the art in those days and they sounded pretty impressive. I was literally using them as room dividers between my living room and dining room so there was about 15 feet behind them and they were firing into a 18 foot wide by 23ft deep room with a two story cathedral ceiling. With this much room to breath, Maggies do quite well. 

They are very low distortion since there is very low intermodulation, and they are very fast, particularly in the mid-range and high frequencies.  Where they fall short is in dynamic slam and imaging precision. The image they present is unrealistically large with not as much specificity as speakers that acts more like a point source. More like a wall of sound. 

A few years ago, after owning several different dynamic driver speakers, I bought a pair of 3.6Rs for my home office, driven with a Krell FPB300. The room is 13' x 14' with 8' ceilings. I was never happy with the sound in this room. I couldn't get the speakers far enough from the walls and from the listening position to get then to sound as good as I'm sure they are capable of. I think if I had more flexibility with acoustic treatments on the side walls at the first reflection points, I might have been able to get a little better sound, but I think my room is just too small for these relatively large panels. 

I replaced them with Goldenear Triton 2+'s which do a lot better in this room. I think in the right room, I might have preferred the Maggies, but in this room, the GEs were a big improvemennt in almost every way except maybe top to bottom coherence. 

From 1990 until 2014 I owned SMGa, 1.7 QR, and 3.7R.   What I loved most was the ribbon tweeter in the 3.7.  In my experience, no other tweeter can touch it in terms of extension while remaining utterly sweet.  

Overall the 3.7s were great speakers.  I moved on because of placement problems-- they are not easy to integrate into many rooms-- and due to amplification requirements.  I know there are those who drive Maggies with tube amps, but in my estimation they are designed for solid state.   Maybe I could have gotten what I wanted from a big Pass Labs amp, but they ain't cheap.   I'm locked into high impedance high efficiency designs at this point.  But I sure to miss those ribbons!