I, too, tend to use the Meguiar's all-in-one cleaner/conditioner product on the XFire. This product is great for routine maintenance (every 3-4 months) of the leather seats.

But I do have the Lexol products on the shelf and find them to be superb whenever performing a "deep-clean & treat" on the XFire every couple of years. I usually apply the cleaner product on the seats, let it soak for awhile per directions, and then wipe it off. I then apply the Lexol Conditioner/Preservative product and cover the seats with large garbage bags to allow the product to soak in overnight. Next day, remove the garbage bags & wipe the seats down. Springtime is when I typically do this deep clean. Seats continue to look "factory-fresh" to this day.