I noticed on another thread that you said that you thought the Europas were perhaps a little unrefined for classical music.
That hasn't been my experience, but I do think that they are brutally honest about upstream equipment and recording quality.
I also agree that at $2900 the callisto has vaulted several price brackets, so it's going to be up against much stiffer competition than my $900 Europas. I'm afraid that price increases may kill GMA's customer base.