I see that the normal size of these acrylic tables is about 18"x24".
But I saw a larger one 24"x24".
Would the few extra inches really make much difference?
It's about $30 more than the sale price I saw!!
I want to get as much as I can afford but don't want it to be "in my way" or too much distance between me and the front of the machine.

I would go with the bigger one if you have the room...the bigger your flat surface is the less you will have to fight with your quilt.

I made mine, too. Look how tiny the bed is on my machine! Only about an inch or so before the needle. This one is plexiglass with wooden feet. I used a dental tool to scratch in the center line and 1/4 inch marks. It is not a perfect fit, so I use a long strip of painter's tape to make sure it does not shift.

You guys are more handy than I am....lol.
Though if I were still married to what's-his-name he'd be able to make me one.
Oh well.

They really do make a difference!
get the biggest one you can afford!
you won't be sorry