Cool, another Maggie owner in the ATL! What part of town are you in? I'm up in Gainesville, myself.
As for the Mye stands, I'll be happy to give you some feedback once I get them in. It's definitely good to have a healthy skepticism about any tweak, so I totally know where you're coming from. It makes intuitive sense to me that stabilization of the panels would improve the performance of the speaker, so I'm excited to get them hooked up and see what they do.
As for the Marchand, I'll just respond here so that if anyone else is curious, they can hear about my experience. If there's more info you'd like, just let me know and I'll be happy to take it to PM.
I used to read about people messing around with external active crossovers and I'd have no real idea what they were talking about. I knew what a crossover was, but I didn't know much about passive vs. active, slope settings, high pass, low pass, etc. I had read enough to feel confident that there would be sufficient benefit to using something like the Marchand, so I went ahead and called Phil to place my order. My strategy was to make this as much of a "plug and play" addition as possible. Magnepan specifies in the 3.6 manual the settings that would be needed for the crossover. So all I had to do was give this info to Phil Marchand, tell him which speakers I was using, and he built it for me to spec. Now I wasn't necessarily trying to obtain a sonic improvement....my goal was to make sure I had enough headroom to properly power these speakers. Several people on the audio asylum suggested that using two channels of my 5-channel Butler amp per speaker would likely be plenty of current for them. Just one channel of the amp had been exhibiting solid control over the speakers, so I felt pretty good about cranking them up once I had them bi-amped. So anyway, I take the L and R outputs from my stereo preamp and run them into the inputs on the Marchand. The Marchand splits the L channel signal into highs and lows, and the same with the R channel. I then take the four outputs (one high and one low per speaker) and run them into four channels on my Butler amp. From there it's just speaker wire from the amp to the speaker inputs. Very easy to set-up!
So that's basically it. The Marchand is transparent enough that it doesn't mess with the qualities I was already enjoying about my gear, and it allowed me to get more out of my amp and make sure I could crank the 3.6s w/out fear of clipping. I've been playing with my sound meter a bit during my listening sessions the past few days, and I'm hitting around 95db (Eminem) without any sign of strain. Things are really sounding good!
Hope that helps!