I just bought Iron Gym about a month ago. I have been using it almost everyday and I do notice a couple of changes. It will fit through an ordinary door way, but just incase be sure to measure yours, It is designed to fit residential doorways 24" to 32" wide with doorway trim or molding up to 3.5 inches wide.
When you use it the first time use a timer, and time yourself, for example don't just work on pull ups then give up, move on to push ups, sit ups and dips. Alternate in between. Spend at least 15 min. working out.
If you spend your time wisely using this product you will see good results. You will feel sore and burn the first day you work out using this. (Which is good because later on your muscles will get use to it)
Overall, I would say this product is great, I still have it and use it, I would recomend it to people who loves to work out or to people who like to start building muscles.