I briefly owned the Super 3is, and when I sold them I wrote this in my ad, "3 dimensional soundstage and image placement as good as I've heard. I used them with a 4 watt Bottlehead Seductor tube amp and they never lacked for volume or dynamics. The downside, these speakers require a subwoofer if they are free standing which is how I used them. Once I had the sub dialed in though, excellent balance." I stand by that statement. Their most positive aspect was the 3D imaging, and biggest drawback was lack of bass. Without the sub, they were unlistenable for me.
I've also owned several pairs of Magnepans, 12qr, 1.6qr and 1.7. Although it was several years ago, I'm remembering the 12s as my favorites. In the room I used them in, they had enough bass not to need a sub (for me). Maggies do a lot right, but what they don't do is what I've come to realize is my top priority. For me, the Maggies don't give a 3D soundstage. A wall of sound is what I hear, and it doesn't draw me in the way a deep 3D soundstage does. And this is with the speakers 5 feet into the room.
Good luck with the Omegas.