They're also relatively big and ideally the thing they're standing on is attached to the wall or has a 40kg damper (i.e. a concrete pavement block or something similar).
I've got a bambu A1 and noise is not a problem at all, I had to put that concrete block underneath it or it'd destroy the cheap coffee table it was standing on due to vibrations :)
Ah yeah that tracks. My enclosed Prusa MK4 is on a big stud-mounted shelf and my huge enclosed Prusa XL is on top of a heavy server rack with locked castors on a concrete floor. Vibration is not noticeable in either case.
I don't need a damper for the printer, I need it for the furniture it stands on.
Re size, the bambu A1 with the AMS lite takes up quite a bit of space - but the option of not having to switch filaments and not having to worry about filament running out mid print is sooo nice.