The Total Gym XLS is a heavy-duty all-in-one home gym system that offers a multitude of workout options.  For instance, it allows you to do squats and Pilates, which the Total Gym 3000 does not.  In addition, it also comes with an upgraded pulley system, a padded glideboard and much more.  If you are not a series workout buff, then the XLS may be too expensive for your needs; however, if you will be spending a few hours daily using this machine, your money will be well spent.  The Total Gym XLS is also great for people just starting a workout routine.  You can start out slow and work your way up to more intense workouts.