I would say the old Xenadrine RFA-1 ( Circa 2000 ), the stuff they make today is crap.
That product would enable you to do cardio for hours, then come home, and take on house work with a smile.
I had never been so shreaded in my life. However with real Ephedra being so hard to come by, I just use Octane by ProSport Nutrtion. It seems as I get older I find myself looking for supplements that have more nutritional value than just something that will make me tweak.