I have a Burris 2x-7x on my .454 Casull.
While the scope has held up extremely well, I am not very happy with the eye relief. I can see the target quit well when the magnification is set from 2x to maybe 4x, but after that, the scope starts to black out. As such, anything above 4x is worthless (at least for me).
If I had a chance to do it all over again, I wouldn't buy another Burris 2x-7x. I think that maybe I would buy an Elite 2x-6x (I think that's the magnification range) because the Elite has constant eye relief.
The point I'm trying to make is, if you are going to buy a variable scope, make sure that you can see properly throughout the entire magnification range. If not, then you can still buy it, but the extra magnification is a waste of money.
Zachary