I would compare the Vista's to the Aerius by saying that the Vista's are everything the Aerius is, but more. More dynamic, more detailed, more neutral, better imaging, etc. The only thing the Aerius seems to have more of is bass, but I suspect that is because the bass on the Vista is better integrated to the panel. The Aerius was a great speaker, and the Vista represents a couple of generations of refinement. They are obiously both from the same gene pool with the Vista improving on all those things that were good about the Aerius and making them better.
I was happy with my Aerius', but our system does double duty in home theater, and I felt that perhaps they were straining a bit to keep up with the loud bits of movies. The Vista's can play a bit louder without strain so they do better with movies. As a bonus, I find myself listening to more music with the Vista's.
It is actually spooky how with stereo recordings the center image of a singer or an instrument is so focused that it seems like it is coming from the center channel even though the center channel is off. The Aerius never quite pulled that trick off.
Chuck