I won't comment on what the "best" scope is for a xbow because it depends on where and when you use it. I have had a Nikon 30mm(tube size) 1.5 x 6 gold, a 1.5 x 6 elite, bushnell halo, a 1.5 x6 30mm(tube size) bushnell and a 2.5 x10 50mm elite (I think thats it) on my exocet (not all at once you wise guys!), My vixen has the Varizone on it. I have hunted with all of those scopes on the exocet and because I really don't mind holding over as it were I really prefer the halo over everything. There are times that I am stuck in a hole in the woods where it gets too dark way too soon and thats where my nikon really shines or is better because of the brightness factor. One of the truly great things about the halo is the lack of parallax and the use of two eyes to really see what is happening outside of the scope picture. I think that the varizone is good for the money but lacks brightness. I guess if I some day I will get another nikon 1.5 x 6 scope with a 30mm tube and slap it on my exocet and be happy as a compromise that lets me stalk and sit in those dark holes in timber. The nikon is super bright, you can have both eyes open and has a humungus field of view. Its a toss up between the nikon and the halo for me.