We just had a demo of the MD12, the Pro-line installer's version of the L1. That is one hot system. A sub is definitely needed for any type of bass, but the articulation of the highs and mids is excellent. Unfortunately, we will not be installing them in our church because of some architectural obstacles, but wow, that is a dynamite system.
Might I add, anyone who thinks they might want to punch things up a bit, might look into the MD12's; they can be stacked 3 high and project up to 120' with less than 6db audible loss, front to back. A separate mixer/amp can be used instead of the L1 base.