I have the Gidget I for my 430 (same body as 440). I think it is fabulous- no shaking.
I don't use an insert. I adjusted the drop down so that the honeycomb table that comes with the machine fills the space, with a teeny bump. It hasn't been a problem when quilting, everything glides as nicely as a fully even surface- no extra money spent.
Excellent value for the money. (And it is easy to move around- I keep it in one spot for sewing but move it to a different location when I need an outfeed table for a large quilt.) I love this table.