@zlone Good questions about the off-axis performance of the Aspen speakers. The horizontal dispersion of the Aspen tweeters and midranges is excellent, producing a very wide soundstage. The vertical dispersion is not as wide, but it's still quite manageable. You just have to be sure that the listening position has the tweeter height at approximately ear level. This is easy to do by either slightly raising the height of the speakers or raising/lowering the seating position for a listener.
These speakers also respond well to toe-in or lack of it, depending on your preferences. If you prefer a direct on-axis response, you can toe-in the speakers significantly. The speakers can also be positioned without any toe-in, which widens the soundstage as long as the room width allows it. I have my FR10s toed-in just slightly, with the left and right speakers roughly 4-5 feet away from the side walls.
One other issue I should mention is transient response. I haven't heard any dome tweeters that sound as fast and effortless as the Aspen planar tweeters. Reportedly, these planars are even lighter than the air they have to move.