I have not used any, but just commenting to let you know that any of the available inserts that fit a Spirit 300 or a Silver B will also fit your x000 model.
I bought that Qlimetal one for my Weber Flat Top that has the same grill dimensions as a Genesis 1100. I haven't used it yet, but it seems to be of good quality. I like the reversible options and that the drain hole is in the middle where it will drain down to the drip tray faster. Good price, too!