Haha - did not revisit the forums until today. Hope you like the M100's Scottinwa.
I like the M100's more now (I closed the two top ports at the back on both the left and right speakers). This substantially improves imaging - at the expense of bass response - (there is still enough low end).

I added outriggers after the fact (good for stability of these tall slim speakers)

Bottom-line:
1. I have now forgotten what the M80's sounded like
2. M100's are very nice. They do require a lot of amp oomph it seems like
3. While I did not believe in break-in, I think my ears were broken-in by the speakers
4. For some reason, it still sounds better in "the next room over" than the listening couch

Ian: Next product to work on = WiFi speakers

BapchaMan