An XCaliber is designed for those windy days where you want to maintain control of your drives. It is a very overstable distance drives with a significant glide. It takes a lot of power to make the disc fly far, but in the right hands it is a very reliable disc even on the windiest of days.
In Halo Star plastic, you get a special version of XCaliber where the disc comes in a two-coloured plastic with a Halo around the edge. Halo discs from Innova are well known and particularly popular if you want a special disc that looks extra good when taken out of the bag.