Thanks cbrgator for the comments.
The reason I want the X15 is so that I don't have to use a spotting scope, I have enough to carry to the bench. Apart from that my eyesight isn't what it used to be. The other reason I like this scope is that it has 4"+ eye relief with 70mm forward from the turret and 52mm to the rear. I need the scope back as far as I can get.
In addition to the poor eyesight I have a bad neck problem, it don't bend much. Can't give up shooting though.