Well, I have owned a pair of Maggie 1.6Qrs for about four years now, and will offer the following advice. In the right room they are amazing--my last listening environment was a wide and deep space, which gave the maggies plenty of room to breathe, and I didn't have early reflection problems. The sound was nothing short of magic, and I could listen for hours without becoming fatigued. BTW, I use a Vandersteen 2Wq for the bottom end, along with BAT pre/power amps). Having recently moved and with the Maggies in a less-than-ideal listening room (narrow, rectangular shape), I have faced some real challenges. My next move will be to add some room treatments, as I've got a lot of energy and excitement in this room in the upper midrange. Don't get me wrong, the speakers are still stellar, but probably less forgiving of their environment. I'd use caution about putting either of these dipole type speakers in a smaller room, unless I was willing to deal with some room treatment as well.
Lastly, the M-Ls are electrostatics, where as the Maggies are planar magnetic with ribbon or quasi-ribbon tweeters. There is a difference in that the Maggie is typically a more lively speaker at the top end (all other things being equal).