No experience with that scope, but it's hard to recommend a scope without knowing what kind of shooting you want to do.
But FWIW, my 6.8 upper is primarily a hunter, so I keep a Bushnell Elite 4200 3-9x40 on it. Love this scope. It's great for hunting and really gathers light well. For grins I tried a few simple CQB type drills at 50 yards and have been surprised at how fast I can get on target with it. Thought I would need some kind of illuminated reticle or dot for that, but now I'm not so sure.
Then I have a 556 upper that is a "farm defense" weapon. Right now it has a simple Millet red dot on it, which is nice for close in work, but at 100 yards it's just hard to see any detail since there's no magnification. So I'm seriously considering switching to a low power variable like this inexpensive Bushnell. If I ever need to hunt with this upper, then I should be able to do so at the ranges I generally hunt at.