I have a Fullfield II, and I like it all right.
However, I just got a VX-II, and I can't begin to say how much better it is for practical use. It was worth the additional cash I paid.
Beef #1: The Burris has a "European-style" focus on the eyepiece. It spins and does not lock. To change the power, you rotate the whole eyepiece, also. So the eyepiece rotates, and the end of the eyepiece rotates more. That means you really can't use a flip-up cap on it. I had one, but lost it because of how it got spun around and couldn't be shoved all the way on. This can be subjective; these aren't BAD features. They just aren't ideal for a hunting scope, all told, in my book.
The Leupold has a locking ring on the eyepiece focus. Set it, lock it, and never think about it again. To change the power, you turn a ring on the scope tube, and the eyepiece stays in place. So, flip-up covers work fine. For a hunting scope, this is a lot better.
Beef #2: The Burris eye relief is somewhat critical. Since it shifts with different power, you can install it for a perfect fit and cheek weld at 3, or 9, or 5, but never for all powers.
The Leupold eye relief also shifts with the power, but it is much, much less critical, so you can set the scope up for the same gun fit at all powers if you do it carefully.
Beef #3: The Burris Ballistic Plex drop reticle has asymmetrical duplex posts. This naturally draws your eye down into the drop tick marks, away from the center of the crosshair, when you shoot quickly. It also has to be zeroed at 100 yards to use the drop reticle, which means you really can't just snap-shoot past 150 yards with a .30-06.
The Leupold Long Range Duplex has symmetrical duplex posts, so that, even with the tick marks present, your eye is drawn to the center more naturally. It is made for a 200-yard zero with a .30-06, so that you can snap-shoot to 250 or so. Same cartridge, but it suddenly became more of a "flat shooter" because the scope design makes more sense.
Beef #4: The Burris adjustment knobs can't be re-zeroed. They indicate what they indicate. The clicks are also not nearly as positive as the VX-II, so you can't tell just by feel, for sure, that you went 1 click or 2, not 1 1/2.
The Leupold adjustment knobs are easily re-zeroed. When you've sighted the gun in, you turn them so that the indicator points to 0. If you want to tweak the knob, you have an automatic indication of how much you moved it, and how to return it to your previous adjustment. The clicks feel 100% positive, and inspire confidence when you turn them.
The Burris is durable and the image is bright and clear. It's not a bad scope by any means. There's a tiny bit of distortion if I move my eye off-center, but it's sure not like a Simmons or something! I just won't balk at spending a little more to get a VX-II again next time, since I can list exactly what it is that I'm spending the extra money on.
If I really wanted a scope for $200, I'd skip the BPLEX, and I might well get a Burris FF II. Nikon would get a good look, too, though.