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

I have had multiple Maggies over the years, SMGa, .6, MG-12, 2.7, currently 3.5s with Mye Stands rebuilt by Magnepan last year.  I have also had many dynamic speakers, Celestion 15, NHT SB-2, Vandersteen 2c, Vandersteen 3A Sig, currently Totem Mites on my desktop.  My observations relative to your questions:

1)  Maggies have compromises, as do all speakers, depending on the persons, the benefits of Maggies outweigh the downsides.  People seem to either love them or wonder what the fuss is about.  

2)  Your room is large enough.  I ran a set of 2.7s in a 14x17 foot room for years and they were wonderful.  You should treat the room, GIK acoustics is a great source of help and reasonably priced treatments.  

3)  You amp has enough power, barely.  The larger Maggies want more power.  I found with my SMGa's, .6, and MG-12s, about 200w a side (into 4 ohms) got the job done.  The larger maggies really like 500w/ch a side or more.  You might want to consider 1.7s if your sticking with your amp, you are what I would consider on the edge.  

4)  They are big.  The 3.7s will dominate your room.  

It is likely the dampening of the backwave by the heavy curtains helped. I have found that if maggies are closer than about 4 feet from the wall behind them, the wall needs absorption, or they get shouty.