Patricia, the gigahoop is 2 x 140 by 200 mm sewing fields over lapped that allows you to combine two B hoop designs. What it doesnt do is increase the area of the machines sewing field. It needs an extension table to prevent it flapping up and down as it's wide. It's awkward and cumbersome to use. I bought one shortly after purchasing my Janome MC 10000, foolishly believing it would allow me to stitch larger designs. Too late I discovered my mistake, so it lanquished away inside it's box for a few years until someone mentioned they were desperate to get hold of one but really couldn't afford it. They now have it, free gratis, as I was happy to be rid of it.
I learnt to split designs instead, then when funds allowed purchased a machine with much bigger hoops.