Great thread @arafiq . Having been on the fence as well with mags, this "thought" comes up, kind of like dipping toes into vinyl . I have friends with 1.7i and have heard them many times and they do sound great. They do things really well and other things that may or may not meet ones preferences.
I recently heard them again in a diff setting and although they do kinda wow you at first, it didn't take long to realize I don't think I would be happy long term - citing many of the same attributes you did, that's why this was such a good read.
The big soundstage etc.. is "cool" but to me always seemed a bit too much or "artificial" for lack of a better word. It sorta mashes everything together compared to dynamic/point source. That's what I miss almost immediately - the dynamics, pin point imaging and bass authority. I run two sealed 15" subs so I should be OK if I decide to try,
Maybe that's just an element I'm used to and living with mags overtime would fall in love, dunno. Like you I have determined that its either 3.7i or the 20's and really its more of a "something to try" and not at all unhappy with current setup - far, far from it. However, I'm not a constant gear swapper, I find something that gels/has synergy and stick with it for awhile.
I always read from experienced/established users/audiophiles that everyone should try planers, just to see - that's always my motivation.
One other note, you have a nice room and your comment about diffusion - I would recommend against mixing up different types. For the front wall do all QRD's (one dimensional only) along with proper corner bass trapping. I've tried it and it can mess things up (diffusion is tricky/complex and in all honesty professional adivice is highly recommended) - I have on front wall two dimensional skylines (vicoustic DC2) which are hemispheric broadband diffusion.(about 12-14 panels). Works well, but I "think" if I were to do it over, would put all QRD - at least from my research, so the usual YMMV, my $.02