had an a4 before the update
now have a analog keys - I enjoy the sound and playability so much more on the keys
it is completely worth it as an upgrade
something about the keys and the joystick
also running the outs into analog effects and back into the inputs adds a vintage tone
I wold say the analog 4 sounds somewhat lush and pro but this could just be a placebo with the keys playability
I would say to anyone - go for the upgrade!!!