Regarding people who have used the air climber: Several years ago I had an Achilles injury and had surgery. One leg is stronger than the other. I cannot run. I was thinking of purchasing the air climber and wanted to know if people considered it low impact. Also is the Achilles used while using the air climber or is it mostly the thighs and calves? Will uneven strength of the two legs make it difficult to use in your opinion? Do you feel like you are going to fall off when you begin? Do you need ski poles when you start?

Is it as good as advertised?

I don't know what an Air Climber is, but you may want to try swimming. You can use a kick board to focus the legs, or just swim to help it out, maybe I'm just biased :-)