I owned LRSs and M3 Sapphires at the same time. It was the Magnepans that introduced me to "boxless speakers" and the reason I bought the Spatials. For 18 months I couldn't bring myself to sell the LRSs and kept promising to hook them (and the subs I used with them) up. Well, I was enjoying the Spatials so much that I kept procrastinating. The good thing was that I got really used to the Spatial's presentation. So when I DID hook up the Maggies, I got a big, big surprise. Compared to the M3s, the LRS treble was grainy and unrefined. Did not see that coming.
Spatial's AMT tweeter gets a lot of accolades here but once they are broken in, the Peerless M100 tweeter sounds beautiful. Doesn't get the praise it deserves.
I sold my Maggies two months ago.