I did the stronggains 5x5 and did 45 min cardio after (as suggested in their site) a few years ago. I didn't get any stronger and I felt more and more sluggish every time I went to the gym. Fortunately, or unfortunately, at that time, MW2 came out and I became a pro at that.
Now it's the leangains diet + 3x lifting a week. Never felt better in my life.