I normally scoff at people who think they can tell anything about a system from a YouTube video...
BUT, there is an A/B demo of the Gaia’s on there from Pursuit Perfect System that is just crazy. He’s got them on KEF refs and you can EASILY hear the improvements they are making. Much more focused imaging and vocals. Much more articulate bass, and even more extension.
I have Sopra 2’s and considering Isoacoustics demos the footers on these I’ve taken the plunge too. $1,350 was a tough pill to swallow but I honestly can’t imagine any other upgrade for even 5 times that amount that would have that much impact.