Ya, you got the same kit Eyleron. Thanks for buying it. The name changed from Delta Max to Fusion Max once Erich made the Karma, Fusion, Alpha series names.
I'd like to explain the, imo, biggest advantage to this design over the others since your question relates.
Here is what happens with the speaker when you go from 10, 20, 30 degrees above the on axis. Sorry, this is an old frequency response before I finalized the cross over, so it's a little rough. The trend is the same though. Hopefully this will make sense.
You see the green line there is a bit of a dip starting to form at the cross over point. That dip is much worse IF we raise the cross over point or separate the distance between the drivers (ie. a 12" or 15" woofer).
So let's look at the Fusion Pure with a 1450hz cross over.
Not bad, but worse. Now about 10db down at the cross over.
The thing I'd like to mention is it can be different above and below the on axis. Take a look at the Fusion Pure below axis (sorry, winter came around the time the Fusion Max finished, so I only have simulations to properly show this, the Fusion Pure shows the effect well enough).
You see there are much bigger nulls below axis than above. It's quite difficult to aim the lobe up like that unless using an active cross over, but it did work out for me on this one. I wanted this to happen for a few reasons.
1. We rarely listen while lying on the floor.
2. Floor reflections are easier to absorb with carpet or rugs, than ceiling reflections.
3. When you stand up, you don't want to think, "huh, where did the vocals go?".
4. For surrounds close to the ceiling pointing down (like Java) there is a fair bit of reflected sound off the ceiling.
5. If mounted under a screen, these naturally fire up a little.
Kind of wordy and technical, but hopefully that helps somewhat. In the first few pages of the "hey guys" thread there is quite a debate about how important this is. The truth is, it is important, but sometimes more than other times.