Your tagline says you want to increase weight, and I suppose you could with the TotalGym. I have a knock off brand of that now that I'm old and wimpy (herniated disc), and I think most of the exercises are really in the toning category, and not in the 'bulking up' category (but I'm no expert on this!)
If you want to increase muscle mass like your tagline says, I think the best approach would be free weights and a good program to exercise all your muscles (and avoid the over-emphasis on the chest muscles most guys in the gym seem to have). A number of years ago I did some combo free weights with cardio exercise and did very well in toning up and reducing my BMI. For bulking up, I would think free weights would be one of the best ways.