Yes I've done it and no I wouldn't do it again.
I ran swapped IRS arms on my Oval and had to have the car absolutley on the floor (bottoming out shocks etc) to have 1/4 degree - camber.
You also run into difficulties with the tracking of the rear suspension as it puts the whole lot into toe out big time. I never really got rid of the toe out at the back which makes a nervous car at speed (erm...110mph on a race track occifer!).
It looks a lot better than running 2 - camber but it doesn't handle as well. It was only for the looks that I did it... I'd run the camber and have it go around corners more
Have a look at my car at
http://www.performanceghia.com
Mike Ghia