Hello,
I briefly used a pair of Montages in my HT where I use Vantages for Mains, Stage Center Channel, Vista as Surrounds and Descent i and Depth Subwoofers. I still have my Montages, but they are currently not hooked up. They really did fine as Surrounds and I imagine would make fine Mains, but would view the use of a Subwoofer as compulsory.
The Ribbon Tweeters are nice, but lack the magic of Electrostats. Since the Montage Review, Stereophile has not Reviewed a single ML Product whereas ML's were all over the pages of Stereophile in the past. If memory serves, the Prodigy was even Stereophiles Speaker of the Year about a decade ago.
Cheers,
JJ