well I traded back into my XPS 2-0 just for the hell of it, my bud now has an SWFA 1-4 sitting in an aeroprecision mount on his 6720. I don't like the push button on, and I don't think it comes on bright enough so you have to turn it up some, I have it on a gun that resides in the safe for now. I have noticed the parallax in the aimpoint, but if you can hold it the same way all the time I guess your ok.
