I used Maggie SMGs, MMGs and the 1.7s over a 40 year period. I was one of those Magneplaner devotees.
BTW, as several have said, they integrate beautifully with REL subs.
I down-sized to a smaller home 2 years ago. My previous listening room was 16x15 feet. The Maggies were great in that room, although the 1.7s were straining trange a bit. After down-sizing to a room only 12' deep, I started having issues with the 1.7s. I just couldn't get the "Maggie sound" that I was used to from them...they were dull and lower level listening made them sound like damp cardboard. After enjoying Maggies for so long, I hated to do it, but I sold them. I picked up a pair of Kef r300s to go with the RELs, and was amazed at how much better they sounded in my room. No, they aren't 5½ feet tall, with a 4 foot tall tweeter, but they gave me much better sound in my room at all volume levels and excellent soundstage and imaging. No regrets!
The Kefs are very nice, but I got a ridiculous deal on them, so I can't say how they'd compete against other speakers in their respective retail price ranges.