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

I only had the MG 2a's, which I loved owning, but IMHO, Maggie's are speakers that often sound better at the store or at shows because their reasonable price makes them attractive to those who don't allocate the funds for the amps that they need.  That was me. I had 100 wpc Sansui BA-2000 amp, but not the right 100 wpc.

I went onto Martin Logan Quests, which were more ballsy,  but have moved on to 40 inch tall dynamic floorstanders because instruments and voices have the right "in the room" size..  A triangle is believable in size as well as sonics.  Same for singers, drum kits, trumpets and the rest.  To me, you lose that proper sizing from five or six foot diaphragms.

I am a Maggie owner (past,present, future). If you go to the Magnepan website and look at the 3.7i section the second picture down shows a system with a pair of Red 3.7i ; that IS my system. The 3.7i are the third pair of Maggies I have owned through the years. They started life as 3.7 and were factory upgraded last yeat to 3.7i . I have also owned at least 30 pair of other speakers as my mains since I started 40 years ago including Infinity IRS, Carver Amazing and Martin Logan Summit plus many big name Dynamic Speakers ranging from AR's, Klipsch, Ohm, B&W etc, etc, etc.  and seem to gravitate back to the Maggies each time. The Maggie's ribbons create an almost ethereal reality to vocals and strings that I find compelling. With the right power ( I use an Indy labs Aragon 8008 at 400 wpc) they can light up a room and produce excellent dynamics as well as, or sometimes better than many other speakers of similar efficiency. I have a small sub a Definitive Technologies 4004 to help the very lowest frequency range (below 40hz) the speed and tightness of the sealed passive ported Deftech matches well with the Maggies and was easy to integrate. 
My only negative I can mention is the need to spend some time finding the ideal placement which is not necessarily more difficult than many other speakers, just different.  In the future I have my eyes on 20.7i but I don't have a compelling need to change since I find the 3.7i to be about as good as it gets.  

I owned 3.5Rs for 2 frustrating years. I tried biamping with W4S MC 250/500 + active XO and subs but could never get what I wanted from them. I replaced them with Emerald Physics KCIIs with Clarity cap and WireWorld XO wiring (which I still have). I have gone through 2 Emerald Physics 100.2SEs, Audio Alchemy DPA-1 (excellent sound but needed more power in my big room, PS Audio M700s, which I did not keep only because, at the time no one bought my DPA-1, so the M700s moved on, and finally (yeah, right-lol) I caught wind of Ric Schultz newest amp the EVS 1200. It checked all my boxes; dual mono It uses 2 of the newest IcePower 600 modules= 1200 watts! to which Ric sprinkles his pixy dust. While it sounded good from the get-go, it took about 50 hours to start coming on strong, and even better at ~ 100 hours. My guess is it is a great amp for Maggie owners (glorious mids and bass), or any speaker owners. My KCIIs, which remind me of maggies in their seamlessness, are too small for my large room. I can’t wait to hear it with my EP 2.8s (dual 15" woofers), which should be here by the 30th. Oh, and it’s only $2200, 30 day money back !!!

OK, as former dealer, everyone here knows I am a Maggie supporter in every possible way.

However, as I always end my posts, it depends upon YOUR ROOM, which everyone knows is the most important variable in any system.

SO, bring them home and listen and see what YOU think.  Personally, they were a revelation to me when I first heard them in my shop in 1973.

We had at least 40 different brands and many models of each brand in the shop and I had to listen to ALL of them to be able to sell them.  Except for Fulton 80 and 100 box speakers (not available for many years now except used on ebay, etc.) there were NO boxes that were even in the same universe as Maggies. 

Today, designers have MANY 6" tall speakers--wonder where they got THAT idea???--and boxes have come a long way, so I am no longer qualified to judge.  Having typed that, I can tell you that Maggies STILL add nothing to the sound of your gear, so set up what you have/wish to buy IN YOUR ROOM and make your own decision.

As for placement, YES, very critical, which is why you need a good dealer who understands room acoustical properties to help you with this.  Also, if you prefer the chest-thumping bass from rock songs or classical orchestras recorded properly, you can always add some subwoofers if that is what you like.

Maggies are the best, as I always post, but you have to like them in your room first.  Enjoy the music...

Cheers!

1+ richopp. I would like to add that the 3.7i might have the best cost to performance ratio in the industry.