Rich, M80OW. I'd bet you will enjoy a larger, more natural center image similar to the active LFR but off-axis as well.
I tried the M5 bookshelf as a center between the 12' spread of my actives at 14' MLP and it was excellent on and off axis but the image was too localized relative to the actives. Other set-ups of course may offer a different experience or perhaps some prefer more of a "vocal point" experience.
Once you hear the pseudo center image of the actives, it's tough to go back to a traditional center.
