I am a dealer for Usher and I used to sell the Addagio.
The Ushers are a far superior set of speakers, the DMD tweeter has even greater resolution than the Addagio's ribbon.
The Usher's bass response is very dependent of room positioning and equipment matching.
The Addagio's bass tends to go a bit deeper and is easier to get that bass, when things are right with the Ushers is quite deep and tight.
Overall the Usher has a more musical presentation, superior treble detail without grain.
The Ushers are a far superior set of speakers, the DMD tweeter has even greater resolution than the Addagio's ribbon.
The Usher's bass response is very dependent of room positioning and equipment matching.
The Addagio's bass tends to go a bit deeper and is easier to get that bass, when things are right with the Ushers is quite deep and tight.
Overall the Usher has a more musical presentation, superior treble detail without grain.