Those 500 series machines are so nice!
I bought a 770QE because I don't have a longarm. You're right- it's big! It was an upgrade from a 150QE that I'll never part with. Almost 20 years and never had a repair. Still running well. Maybe someday I'll give it to my granddaughter if she starts sewing but until then it stays with me.
Enjoy your new machine!!!