I’ve never toyed with the Nyx, but it does seem a real shame to put a huge reverb on a device and have only mono out. I have the Erebus v3; it had some cool features, like its variable filter, but it had some serious tuning issues for me.
I would definitely not call the Abyss “typical”: it has a really particular, beautiful, characteristic sound to it; the layout is basically intuitive and perfect; its multi-mode setup makes it surprisingly versatile; its oscillators and filter are wonderful; its extra effects, the delay/reflector/phaser combo, really emphasize the most interesting aspects of its sound. The Abyss is kind of a one-of-a-kind device for me, really, but I’m sure others find it less spectacular.