I have a Total Gym, and I have mixed views about it:
On the posivie side, it is very useful for pulling movements that are not possible to do at home with free weights. For example, I use it for pull downs (you actually pull a percentage of your body weight up, but the movement is very similar to a pull down machine at the gym). I also use it for a hamstring curl-type exercise. Both of these exercises (as far as I know) cannot be done with free weights (I know you can use ankle weights for hamstring curls, but with the Total Gym, you can really increase the weight).
On the negative side, firstly, the total gym that we bought was not exactly the same as the one they use on the adverts, and this really annoyed me. The main thing is that it doesn't have the platform for doing the squats. They can still be done, but not comfortably.
Secondly, another thing that annoyed me was that in the advert, they show an old lady easily sliding the folded up gym into her wardrobe. What rubbish! I really struggle to carry the weight of it. For about the first year, I hardly used it because it was a pain to set up each time, and I usually ended up trapping my fingers whilst trying to unfold and set it up. Now that we have a gym room set up, I have the Total Gym set up all the time, so I use it regularly for the pulling exercises I mentioned.
Thirdly, the squats that they show are way too easy even at the maximum level. From minimum to maximum incline, you are lifting 5% to 60% of your body weight. So, you can imagine how easy the squats are! You may as well do them on the floor and use your full body weight!
Fouthly (nearly done!) they advertise using the Total Gym for a cardiovascular workout, where you do squats and a pull down movement at the same time. Nice theory, but it's extremely boring, and I find having my ears so close to the machine for a long period of time too noisy. (Also, watch you don't catch your hair in the runners, done that, very very very painful...)
So, to sum up, it is a good piece of equipment, and you can do a lot of different exercises on it, like they say. But, I believe that most of the exercises can be done more effectively with free weights. Also, don't be sucked in by their enthusiasm. I think I was, and that's probably why I was a little disappointed. Having said that, I only paid a few hundred (English) pounds, so even if I only use it for those 2 exercises, I think I got my money's worth.
Hope this helps in your decision.
Regards,
Sharon.