I've had 1.6, 1.7 and 3.7. As a rule of thumb, bigger is better with Maggies.
While I think the true ribbon is WONDERFUL, I'm not sure it's worth the upgrade from the 1.7. If you were going from the 1.6, then yes.
The 1.7 tweeter(s) are pretty good.
Magnepan 1.7i vs 2.7i?
Recently upgraded my integrated amp to a Hegel 400 which has brought my Maggie 1.7s to a whole new level of listening. The clarity and the force that the Hegel brings is awesome, however I’m curious how much additional bang for the buck I’d get by trading up to the 2.7s with their true ribbon tweeter?