Personally I would get the Janome table. With the 6600 being a flat bed machine only, you won't use the up down function of the gidget table. Also, the Janome table has a small drawer on the left side. Perfect for storing your presser feet, needles and a few tools. I have the Janome table and love it. VERY STURDY and it does not "jump" if I am sewing a high speed. Also, the way the Janome table is made you will have, albeit small, table space on the left to hold your project and I don't see that with the Gidget.
Just my opinion but hope it helps.