Bought one of these the other day on impulse at a sporting goods store that had them 50 % off, Cost me 25 bucks.I wasn't expecting much but it's actually pretty decent.It came with 2 sets of tubing with handles,one med heavy and on med light, a short bar to attach the tubing to,a door attachment and a jogging belt gizmo(don't see getting much use out of the jogging belt thingy,fancy that).
I definitely say that the quality of the tubing is far superior to any others I've had.Even when you stretch them way out you don't get the feeling the tubing is going to snap(which has happened to me before).The door attachment looks pretty cheap at first, it's just a loop you jam in the door and feed the tubing through, but it's pretty useful for pull throughs,leg curls/extentions and triceps, russian twists etc.The bar has it's uses too for squats, floor presses whatever.Granted you have to twist the tubing around the bar quite a few times to get decent tension,which is the only real negative of this product for me, I would like heavyier tubing,but what do you expect for $25.
All in all I definatly say this would be great for people who travel or want something cheap to use at home.
