I've have the Total Gym for many years and love it. You use your body weight to do your exercise so it's adjusted to your strength. I am more toned than I ever was when I was young, my legs and arms are stronger and I can keep my tummy in reasonable shape. My husband starting using it about a year ago and likes that it has helped his arm strength.
Total Gym 1400 Deluxe Home Fitness Exercise Machine Equipment with Workout DVD is on Amazon for around $250 and is a step up from mine.